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Heat the oil in a large skillet over high heat until shimmering, about 1 minute. Add the onion and saué, stirring often, until softened and browned around the edges, about 2 minutes. Add the garlic and chili powder. Sauté until aromatic about 30 seconds. Add the beef, salt, ground black pepper, and brown sugar. Reduce the heat to medium. Cook, using a wooden spoon to help break the meat into small pieces, until the meat is no longer pink, about 3 minutes.
Add the tomato puree, ketchup, water, and Tabasco (if using). Cook until slightly thickened, about 4 minutes.
Adjust the seasonings with salt and pepper to taste. Spoon 1/2 cup of the meat mixture into each hamburger
bun and serve immediately