1-First Step: Prepare the basil and ingredients Start by washing and drying the Thai basil leaves well. This matters because too much water can thin the pesto and dull the flavor. Measure out the cashews, peanuts, garlic, chili flakes, oil, salt or soy sauce, vinegar, sugar, and lime juice so everything is ready to go. If your basil is wet, pat it dry with a clean towel. The leaves should be packed, but not crushed. Fresh, dry herbs make a brighter sauce with better texture.

2-Second Step: Add the nuts and garlic first Place the cashews, peanuts, and crushed garlic into the bowl of a food processor. Pulse a few times until the nuts break into smaller pieces. This helps the blades catch the basil more evenly later. If you like a smoother pesto, you can pulse a little longer, but do not let the mixture turn into a paste just yet. At this stage, the aroma will already smell strong and fresh. That is a good sign. Garlic and roasted nuts build the base flavor before the basil goes in.

3-Third Step: Add the basil and chili flakes Add the Thai basil leaves and chili flakes to the processor. Pulse several times until the basil starts to break down. You will see the mixture turn into a rough green blend. Scrape down the sides as needed so every leaf gets chopped. The basil may look bulky at first, but it will shrink quickly. If you want a more rustic pesto, stop early. If you want a smoother sauce for noodles or dipping, keep pulsing a bit longer.

4-Fourth Step: Pour in the oil, vinegar, seasoning, and sugar With the machine running or pulsing, slowly pour in the olive oil or sesame oil. Add the sea salt, or if you prefer, use soy sauce or tamari. Then add the rice wine vinegar and caster sugar. Blend until the pesto looks well combined and glossy. The oil helps everything come together, while the vinegar and sugar balance the bold basil and garlic. Sesame oil gives a deeper nutty note, while olive oil keeps the flavor lighter and more herbal.

5-Fifth Step: Finish with lime juice and taste Now squeeze in the lime juice from half a lime. Start with a little, then taste. You may want a touch more if you like a brighter, sharper finish. Taste the pesto and check the balance. If it needs more salt, add a small pinch. If it tastes too sharp, add a little extra sugar or oil. This is the part where the recipe becomes yours. Thai basil pesto works best when the flavors feel lively but balanced. You want freshness, salt, acid, heat, and richness all working together.

6-Final Step: Serve right away or store for later Use the pesto immediately over noodles, grilled chicken, roasted vegetables, rice bowls, or as a dip for bread and crackers. It also works well with fish, especially if you enjoy Asian-inspired dinners. If you want a meal idea, try it with something like hoisin salmon noodles for a fast and flavorful dinner pairing. If the pesto seems a little thick, add a teaspoon of water or a small extra drizzle of oil. If it is too loose, add a few more nuts. The goal is a spoonable sauce that coats food well without running off the plate.