Preheat oven to 350°F. Lightly brush one side of the wonton shells with melted butter. Place butter side down into muffin tin and bake for 8-10 minutes or until golden brown and crispy.
In a small bowl, combine tomato paste and water. Set aside. Heat oil in a large pan over medium heat. Add ground beef and cook 6-7 minutes, until lightly browned. Drain grease from meat. Return to heat, mix in tomato mixture and taco seasoning. Cook and stir until combined and cooked through, about 8-10 minutes.
Spoon equal amounts of taco meat into prepared taco bowls and top with guacamole, sour cream, cheese, cilantro and sliced jalapeño. Serve immediately.