Boil penne pasta in salted water until al dente; reserve 2 tbsp pasta water and drain.
Blend fresh basil leaves, garlic paste, parmesan cheese, black pepper, salt, and olive oil into a smooth pesto paste.
Transfer drained warm pasta back into the pot over low flame.
Pour in the prepared pesto paste and reserved pasta water.
Toss gently for 1 minute until pasta is well coated and serve immediately.