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| ground beef: 1 lb |
| onions (chopped): 1/2 cup (chopped) |
| garlic: 1 clove (minced) |
| water: 2 cups |
| tomato sauce: 8 oz |
| lentils: 1/2 cup |
| ketchup: 1/2 cup |
| apple cider vinegar: 1 tsp |
| ground mustard: 1/2 tsp |
| black pepper: 1/4 tsp |
| hamburger buns: 8 buns |
Credit: Food.com