Brown beef in a medium skillet over medium heat, breaking up with a wooden spoon as it cooks, about 8-10 minutes. Stir in taco seasoning and water, cook an additional 5 minutes or until water fully absorbs; set aside.
In a bowl, whisk together corn meal, flour, eggs, buttermilk and oil. Stir in taco meat, cheese and jalapeños.
Heat a nonstick griddle or skillet over medium-high heat. Pour or scoop the batter onto the hot surface in ¼ cup scoops. When bubbles begin to appear on the surface, flip carefully with a spatula, and cook until browned on the underside, 1 to 2 minutes more. Serve topped with salsa, sour cream and lettuce, if desired.