When cooking vegetables, you want to salt each "layer" as you go. About 1/8 tsp for each.
16 oz linguini
3 tbsp olive oil
1 onion, roughly chopped
1 tbsp minced garlic
1/4 tsp crushed red pepper flakes
2 zucchini, halved and sliced
3 roma tomatoes, chopped
12 fresh basil leaves
salt and pepper to taste
Bring a large pot of salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
Meanwhile, heat oil in a large skillet over medium-high heat. Add onion, garlic, red pepper, salt and saute until soft and golden. Add more oil if needed and stir in zucchini and salt. Saute about 5 minutes or until soft. Add tomato, salt and cook just until warm. Chop basil and add to vegetables.
Plate pasta and top with vegetables and freshly grated parmesan cheese.