Add pasta to a large pot of boiling, salted water. Reduce heat and cook according to package directions.

Once pasta is cooked, scoop out 1/4 cup of water and reserve. Place a colander or sieve in the sink and drain pasta. Return pasta to the pot, add the reserved water and stir in the pesto. Mix until pasta is evenly coated. Serve immediately, garnished with grated Parmesan and a garlic flower.