Baked Shells with Pesto, Mozzarella, and Meat Sauce

Ingredients

• ¼ cup grated Parmesan
• 2 cups canned chopped tomatoes, drained (from one 28-ounce can)
• 1 pound ground beef
• 1 ½ teaspoons salt
• ½ cup store-bought or homemade pesto
• ¾ pound medium pasta shells
• 6 ounces mozzarella, grated (about 1 1/2 cups)
• + 2 more ingredients
• • 1 tablespoon cooking oil
  • 1 onion, chopped

1. Heat the oven to 400°. Oil a large baking dish (about 9 by 13 inches). 2. In a large stainless-steel frying pan, heat the oil over moderately low heat. Add the onion and cook, stirring occasionally, until starting to soften, about 3 minutes. Stir in the ground beef and cook, breaking it up, un...

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