Step 1 In a food processor, pulse together the basil, pine nuts and garlic in a food processor until chopped. Add the cheese and oil and process until a coarse puree forms. Season to taste with salt and pepper. To store: transfer the pesto to a jar and smooth the top. Pour a thin layer of olive oil over the top to cover the surface of the pesto. This makes a generous cup pesto that will keep, refrigerated, up to 1 week.