INGREDIENTS
2 tbsp
olive oil
1
yellow onion, thinly sliced
4
garlic cloves, thinly sliced
red-pepper flakes, to taste
1 tbsp
cider vinegar
12 oz
thin spaghetti or linguine, broken in half
2 lb
Roma or Campari tomatoes, chopped (about 8 to 12 tomatoes)
1 tsp
kosher salt
1/2 tsp
black pepper
2 oz
finely grated Parmesan (about 1/2 cup), plus more for serving
About 1 cup basil leaves, for serving