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You are here: Home » Gluten Free

Spiciness: Mild

Fresh Basil Pesto - Fix A Bitter Pesto

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This delicious homemade basil pesto recipe gives tips to fix a bitter basil pesto or any bitter pesto for that matter.

This basil pesto recipe is fast and easy to make and will not be bitter if fresh ingredients are used in a minimally processed way.

Fresh Creamy basil pesto in a small white bowl on a delicate flowered napkin. Spoon sticking out and cherry tomatoes in background. this …
Super smooth basil pesto run through a blender.

The Culprits of Bitter Basil Pesto

  • Basil that is bolting (AKA flowering). Definitely don't use any basil flowers. They are very bitter. Older leaves are also more bitter than younger leaves (I still use them though). Use young basil plants for the best pesto results.
  • Rancid olive oil. You know the taste. Buy some extra virgin olive oil. Keep it in a dark place away from any heat. Taste it before you use it.
  • Rancid nuts. You know that taste to. Taste your nuts. If they are bitter then the pesto will be bitter.
  • Old garlic. If the garlic has the green shoot coming out of it simply take it out. That means it's older garlic. I still use the clove but take out the green shoot.
  • Too much processing in the food processor or blender. I like chunky pesto anyway. Don't just run the food processor or blender. Either make the pesto with mortar and pestle (if you have the energy) or pulse it gently in the food processor.
Mature basil plant in a windowbox with other herbs in front of a window of a brick house.
My basil plant. It's base is old and woody and it's started to bolt (flower). Young basil is best to use for pesto that's not bitter, but I don't waste homemade herbs. Discard any flowers as they are the most bitter.

How To Fix Bitter Basil Pesto

  • Buy better quality oils and nuts. Always taste them before making basil pesto to check if they are rancid or bitter.
  • Add a little lemon juice to the pesto. This helps mellows out any bitterness. Lemon juice also gives the basil pesto a little tang.
  • Add more Parmesan cheese.
  • Add more nuts (that taste good!).
  • Use fresh garlic or add less or even toast the garlic first before using in the pesto.
  • Make basil pesto with a mortar and pestle or by lightly pulsing pesto in a food processor. I'm no chemist but oils and the nuts in oils get denatured quickly and can change taste when blended on high speeds for a long time.
Chunky light green basil pesto in a food processor with the lid off.
Super chunky basil pesto pulsed lightly with a food processor. Sometimes you may want a smooth pesto and other times you may want it chunky. Exact same recipe, just different textures.

Homemade Basil Pesto is Versatile and Easy!

Fresh basil pesto doesn't necessarily need a recipe. Homemade basil pesto ingredients are extremely versatile so try not to get too caught up in the "recipe".

Substitutions for pine nuts: Use walnuts, brazil nuts, almonds, cashews, sunflower seeds, whatever! Allergic to nuts or seeds? Make basil pesto with no nuts.

Looking for a vegan basil pesto recipe? Substitute a couple Tablespoons of nutritional yeast or a non-dairy vegan Parmesan cheese alternative.

Lastly, just leave the cheese out and focus on nuts, herbs, garlic, and olive oil. Basil pesto is delicious without cheese too!

Want a "warmer" taste in your fresh homemade basil pesto and have more time?  Cook the garlic and pan fry until fragrant (1-2 minutes) and/or bake the pinenuts at 350F until they are fragrant and have a roasted light brown color (generally around 5-8 minutes).

Smooth Vs. Chunky Fresh Basil Pesto

A kick booty blender or food processor will emulsify the mixture beautifully making an uber smooth basil pesto.

Having said that, it may also make basil pesto more bitter because of the overprocessing of the oil and the oil in the nuts.

A chunkier basil pesto is what I prefer for certain dishes or just because I'm bored with smooth pesto and craving another texture.

Chunkier pestos are delicious for more rustic dishes. They are also delicious on top of bread, toast, or bruschetta. Check out my Shrimp with Basil Pesto dish with chunky basil pesto.

Don't have a food processor? Make fresh basil pesto without a food processor by using a mortar and pestle or by chopping all the ingredients finely by hand.

Lots of garden fresh basil sprigs on a wood cutting board with a salad spinner.
Getting ready to put it in the salad spinner to get rid of any dirt or bugs.

Serve Basil Pesto With ...

Basil pesto is perfect over any kind of pasta - spaghetti, orzo, fusilli, etc...

Use pesto as a sauce or a spread on pizza, tarts or galettes, or sandwiches.

Toss basil pesto into a salad as a dressing and add a little water or oil to make it thinner if it's too thick.

Spoon homemade basil pesto over a ripe summer tomato or over fresh or cooked vegetables or casseroles...  #summerlove

Can You Freeze Basil Pesto?

Homemade fresh basil pesto freezes and defrosts beautifully.

TIP: Freeze leftovers flat in a ziploc bag. Break off and thaw what you need as you need it and keep the rest frozen. See picture or video above.

Basil pesto in 4 snack bags with two of them sealed and 2 of them open. One has a label with the date.
Freeze leftover portions flat in snack bags and label and date. You can easily break off a piece and refreeze the rest if it's too much if it's frozen flat.

Serving Suggestion

Serve this homemade basil pesto recipe with these complementary dishes:

  • White bowl of chunky red onions, cucumbers, tomatoes, yellow and red peppers salad. Wood spoon it it.
    Easy and Simple Summer Salad
  • Blue oval bowl of golden brown pan fried gnocchi dumplings. On a white table with a silver fork and white napkin.
    Easy Homemade Potato Gnocchi
  • Cooked shrimp in a deep plate with halved cherry tomatoes and basil pesto. Garnished with Pine nuts.
    Shrimp with Basil Pesto and Cherry Tomatoes
  • White bowl of tomato based soup with sausage, carrots,arugula, white beans, and garnished with thin slices of Parmesan cheese. Spoon and baguette on the side.
    Minestrone Soup with Sausage and Cannellini Beans

You May Also Like

If you like this basil pesto dish you may also like these similar pesto type recipes:

  • White bowl of green dill pesto with a spoon sticking out in the middle of a cutting board with a lemon, pile of grated Parmesan cheese, garlic bulb, handful of walnuts and fresh dill sprigs.
    Fresh and Easy Dill Pesto with Lemon
  • 5 crostini (little toast) with green pesto and parmesan sprinkled on the top. Garnished with lemon zest. On a white plate
    Mizuna and Walnut Pesto Crostini
  • White Bowl with black outside filled with diced oranges, chopped parsley and pistachios with a silver spoon.
    Chunky Parsley Pesto with Pistachios
  • Blue bowl of green mint and pecan pesto blended with a silver spoon sticking out.
    Fresh Mint And Pecan Pesto

Things In My Kitchen:

  • Food Processor to blend, grate, and slice ingredients.
  • Blender - for serious blending of pestos, drinks, smoothies, soups, etc...

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Fresh Homemade Basil Pesto - Fix Bitter Pesto

Close up. Fresh Creamy basil pesto in a small white bowl on a delicate flowered napkin. Spoon sticking out and cherry tomatoes in background.
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EatSimpleFood.com

This fresh homemade basil pesto recipe gives tips to fix a bitter basil pesto or any bitter pesto for that matter. This is a fast and easy recipe to make and will not be bitter if fresh ingredients are used in a minimally processed way.

  • Author: beckie
  • Prep Time: 15 minutes
  • Total Time: 15 minutes
  • Yield: 1 ¼ Cups
  • Category: Condiment
  • Method: No Cooking Involved
  • Cuisine: Italian
  • Diet: Gluten Free

Ingredients

  • 3 cups packed basil leaves (~ 1.5 oz), flowers removed
  • 2 small cloves garlic (~ 2 tsp), remove any older green spouts
  • ⅓ cup pine nuts, make sure these nuts don't taste rancid like bitter oil
  • ½ cup grated Parmesan cheese
  • ½ cup extra virgin olive oil, this needs to not taste bitter to start with, don't skimp!
  • 2 tablespoon fresh lemon juice
  • ~ ½ -¾ teaspoon salt
  • black pepper to taste

Instructions

  • Add all ingredients except olive oil to a food processor or blender.  
  • Blend, stop, and push down any basil remnants with a spatula.  Drizzle in the olive oil slowly while blending if that's an option.
  • Blend basil pesto until smooth in a blender if you want a smooth pesto.  Blend in pulses in a food processor if you want a chunky pesto (less processing makes a less bitter pesto).
  • Add salt, lemon juice, or olive oil to taste.  Happy pesto eating!  Beckie

Notes

Fix Bitter Pesto:

    • Buy better quality oils and nuts. Always taste them before making basil pesto to check if they are rancid or bitter.

    • Add a little lemon juice to the pesto. This helps mellows out any bitterness. Lemon juice also gives the basil pesto a little tang.

    • Add more Parmesan cheese.

    • Add more nuts (that taste good!).

    • Use fresh garlic or add less or even toast the garlic first before using in the pesto.

  • Make basil pesto with a mortar and pestle or by lightly pulsing pesto in a food processor. I'm no chemist but oils and the nuts in oils get denatured quickly and can change taste when blended on high speeds for a long time.

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  1. Susan Powell says

    August 02, 2025 at 4:08 pm

    DELICIOUS! I used Italian sweet basil from my garden and pistachios instead of pine nuts or walnuts. So good.

    Reply
    • Beckie Hemmerling says

      August 04, 2025 at 11:09 am

      Thanks Susan! I love basil pesto with pistachios and wanted to rewrite the recipe but thought I should just leave it. Pistachios is definitely where it's at and I love it chunky and not smooth too 🙂

      Reply

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Hey y'all!

I’m Beckie Hemmerling. I love food and I think of it on a basic level of providing strength & nourishment. Cooking has helped me *try* to figure out life, not just my own, but also other people's. I have cooked through many joys / sorrows and cooking has always been a meditative place through these highs & lows. More background info →

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