Brown the meat and chopped onion over high heat in a large skillet. Remove from heat and drain the fat well. Using a leaner meat will make this easier. Combine the rest of the ingredients, and bring to a boil, and then reduce
heat to simmer
. Let simmer until mixture thickens to desired consistency. Add additional water to adjust if necessary. Don't worry about adding too much water, because it simply evaporates if left on the heat. When done, remove from heat and place meat into taco shells. Add desired toppings and enjoy! This recipe makes about 10-12 tacos, or maybe a little more, depending on how big you like your tacos.