My aunties whipped up this idea as a twist on one of my faves. It still is the best thing, even today

1 tablespoon olive oil
1 medium onion, chopped
2 cloves garlic, minced
1 lb ground beef
1 cup tomato sauce
2 tablespoons ketchup
1 tablespoon Worcestershire sauce
1 teaspoon mustard
1 teaspoon brown sugar
Salt and pepper to taste
6 flour tortillas
1 cup shredded cheddar cheese
1/2 cup sour cream (optional for topping)
Chopped green onions (optional for garnish)