Add the basil, walnuts, lemon juice, salt, and pepper to a large food processor. Scrape down the sides a couple of times.
Pulse until everything is finely chopped and evenly combined with no big pieces remaining.
With the processor running, slowly drizzle in the garlic-infused olive oil until the mixture turns smooth and spreadable.
Stir in the grated parmesan cheese by hand to keep the texture just right.
Serve immediately, or store in an airtight container in the fridge for up to 1 week. Pesto also freezes well in small portions for quick meals later.
Notes
Note 1: Use chopped walnuts for a budget-friendly option.Note 2: Use a microplane to make quick work of this task.Yields: 1 cup of pestoDairy Free Pesto: To make it dairy-free, swap parmesan for 1–2 tablespoons of nutritional yeast.Pesto Freezing Tips: Freeze leftovers in ice cube trays for quick pasta nights later.Low FODMAP Notes: Low FODMAP ingredient information is based on the Monash University Food App and FODMAP Friendly App testing results.