fresh basil leaves, packed • pine nuts (or walnuts) • grated Parmesan cheese • garlic cloves • extra virgin olive oil • Zest of 1 lemon • Juice of 1/2 lemon • Salt and freshly ground black pepper, to taste • pasta (spaghetti, linguine, or your preferred type) • shrimp, peeled and deveined • olive oil (for cooking the shrimp) • red pepper flakes (optional) •