Greek Tacos

In a saucepan, heat oil over medium-high heat. Add meat and onion and cook until browned, about 5 minutes. Add garlic, mint, paprika, and salt. Cook 1 minute. Stir in diced tomatoes and ketchup. Reduce heat to low and simmer 10 minutes. Serve with warmed taco shells, cucumber, tomato, and feta.