Weeknight Meat Sauce With Rigatoni

Ingredients

• 2 ounces cremini mushrooms,trimmed and halved
• 1 tablespoon olive oil
• 1 onion, chopped fine
• salt and pepper
• 3 garlic cloves, minced
• ¼ teaspoon red pepper flakes
• 1 tablespoon minced fresh
• oregano or 1 teaspoon dried
• 1 tablespoon tomato paste
• 1 pound 85 percent lean ground beef
• 3½ cups water
• 1 (28- ounce) can crushed tomatoes
• 1 (14.5- ounce) can diced tomatoes, drained
• 1 pound rigatoni
• 3 tablespoons chopped fresh parsley