Spinach and Ricotta Stuffed Pasta Shells

large pasta shells

homemade tomato sauce

Parmesan cheese, freshly grated

extra-virgin olive oil, for drizzling

extra-virgin olive oil

small onion, finely chopped

garlic clove, finely chopped

fresh spinach leaves

nutmeg

fresh ricotta cheese, drained

basil leaves, chopped

salt & pepper