Step 1- In a small pan bring water to a boil. Add beef bouillon cubes and stir until dissolved, remove from heat and set aside. In a large skillet brown the ground beef and onion over medium-high heat. Drain off any excess liquid.
Step 2- Add oregano, cumin, garlic, chili powder, and pepper to the browned meat. Add beef bouillon/water mixture and tomato sauce and stir to combine. Simmer for 20 minutes or until thick.
Step 3- While beef is simmering, split hamburger buns and butter each of the cut sides. Heat a large skillet to medium heat. Place split hamburger buns cut side down into the skillet and cook until lightly browned on the bottom.
Step 4- Place taco meat on top of the bottom half of the hamburger bun, top with shredded cheese, lettuce, and tomato. Repeat with remaining sandwiches.
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