NYT Cooking: Pesto is a mouthful of bright summer — basil made more so. You can buy it in a jar or in the refrigerator section of your grocery story, but there is nothing better than making it yourself. Fresh basil can be found in abundance at farmers’ markets in the summer. Just clean, take the stems off and throw the leaves in a food processor with nuts and garlic. Dribble in the oil and you’ve got a versatile sauce for pasta, chicken or fish.