In a large pot or Dutch oven over medium-high heat, crumble in the ground beef. Cook and stir frequently until it's well-browned; drain off the excess fat.
Pop in the onion and celery to the pot. Cook and stir until the onion tenderizes (around 3 minutes). Lower the heat to medium, then pour in the chili sauce. Stir in vinegar, sugar, and mustard. Let it simmer till the mixture reaches your preferred consistency.
Grab some sliders or buns, load 'em up, and enjoy!
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