Step 1

Combine ground beef, water, 1/2 cup diced onion, ketchup, butter, garlic, chili powder, salt, black pepper, cumin, celery salt, and cayenne pepper together in a pot. Mix with a potato masher or spatula over medium-high heat until mixture has a finely ground consistency and begins to bubble, about 10 minutes.

Step 2

Bring beef mixture to a simmer, reduce heat to medium-low, and cook, stirring occasionally, until sauce thickens and reduces, about 1 hour. Season with salt and pepper to taste.

Step 3

Bring a large pot of water to a boil. Cook hot dogs in boiling water until heated through, 5 to 7 minutes.

Step 4

Preheat oven to 350 degrees F (175 degrees C). Arrange hot dog buns on a baking sheet.

Step 5

Cook buns in the preheated oven until soft and warm, 2 to 3 minutes.

Step 6

Place 1 bun on a plate. Place a hot dog in the bun and top with meat sauce. Drizzle yellow mustard and diced onion over the meat sauce. Repeat with remaining hot dogs.