- 1 pound whole-wheat pasta
- 1 onion, sliced
- 1 tablespoon extra-virgin olive oil
- 1 (14.5 ounce) can tomatoes, drained
- 1 pound frozen spinach
- Salt and freshly ground pepper to taste
- 1/3 cup crumbled feta cheese
- Cook pasta in a large pot of boiling salted water until al dente, according to package directions. Meanwhile, heat oil in a large skillet over medium-high heat and saute onion. Add tomatoes; simmer for 10 minutes. Stir in spinach; heat through. Drain the pasta, toss with sauce and season with salt and pepper. Top with feta.