1. Heat oil in a 12-inch skillet over medium-high heat. (If you'd like to brown lasagna under the broiler before serving, use an oven-safe skillet.) Add beef, onion, salt, garlic and oregano; cook 5 to 6 minutes, breaking the meat up into small pieces, until beef is cooked through. Add vinegar and cook 1 minute.
2. Stir in tomatoes and 3 cups water; bring to simmer. Stir in noodles and simmer 20 to 25 minutes over medium heat, until noodles are tender, scraping the bottom of the pan with a wooden spoon frequently to prevent sticking and making sure the noodles are always submerged in sauce.
3. If broiling, preheat broiler. Remove skillet from heat. Stir in 1/4 cup of ricotta. Season to taste with salt and pepper. Use a small spoon to dollop remaining 1/2 cup ricotta over the lasagna (do not stir). Sprinkle with mozzarella and Parmesan; cover and let sit until cheese is melted, about 5 minutes. If broiling, place under the broiler uncovered about 4 minutes until cheese is melted and golden-brown in spots. Sprinkle with basil and serve.
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Directions
1. Heat oil in a 12-inch skillet over medium-high heat. (If you'd like to brown lasagna under the broiler before serving, use an oven-safe skillet.) Add beef, onion, salt, garlic and oregano; cook 5 to 6 minutes, breaking the meat up into small pieces, until beef is cooked through. Add vinegar and cook 1 minute.
2. Stir in tomatoes and 3 cups water; bring to simmer. Stir in noodles and simmer 20 to 25 minutes over medium heat, until noodles are tender, scraping the bottom of the pan with a wooden spoon frequently to prevent sticking and making sure the noodles are always submerged in sauce.
3. If broiling, preheat broiler. Remove skillet from heat. Stir in 1/4 cup of ricotta. Season to taste with salt and pepper. Use a small spoon to dollop remaining 1/2 cup ricotta over the lasagna (do not stir). Sprinkle with mozzarella and Parmesan; cover and let sit until cheese is melted, about 5 minutes. If broiling, place under the broiler uncovered about 4 minutes until cheese is melted and golden-brown in spots. Sprinkle with basil and serve.