Cook onions in olive oil until soft. Add meat, jalapeno, thyme, and parsley. Cook until the meat browns. Stir in 2 tablespoons water, salt and pepper, cover and simmer for 10 minutes. In separate bowl beat together, yogurt, garlic, mint and salt. Cook pasta as directed. Toss with meat sauce and keep warm. Pour yogurt sauce over the top. Stir together butter, paprika and cayenne. Pour over the pasta and garnish with mint leaves.