The phrase "extra pesto" refers to adding or requesting more of the sauce made from basil, garlic, pine nuts, and olive oil called pesto to a dish. Full definition
Be sure to make extra pesto because you can toss it with cooked vegetables or use it as a salad dressing. (diabeticfoodie.com)
I added extra pesto and did half veg broth, half water. (eatgood4life.com)
To serve, place salmon atop rice and cauliflower, adding toasted pumpkin seeds, a lemon slice and passing extra pesto if desired. (nourishing-matters.com)