So good and so easy! I love the Lasagna Roll-Ups stuffed with the meat and cheese mixture!
1 onion, chopped
3/4-1 lb. ground beef
1 tablespoon tomato paste
5 garlic cloves, minced (I used some from a jar of minced garlic)
1 (14.5 oz) can tomato sauce (or make your own)
1 1/2 cups ricotta cheese
1 large egg, lightly beaten
Adjust oven rack to upper-middle position and heat oven to 350 degrees.
Make Sauce: Place beef and onion in saucepan and cook over medium heat, breaking up mixture with wooden spoon, until no longer pink, about 5 minutes. Using slotted spoon, transfer 1 1/2 cups beef mixture to paper towel-lined plate and reserve. Add tomato paste, garlic, and pepper flakes to pot with remaining meat mixture and cook until fragrant, about 1 minute. Stir in tomatoes and simmer until sauce is slightly thickened, about 20 minutes. Season with salt and pepper. (At this point, sauce can be refrigerated in airtight container for 3 days.)