Mix ground pork and chorizo; form into balls and refrigerate 20-30 minutes.
Cook bacon on griddle; set aside warm.
Cook onion discs in bacon fat; season with salt, then brown sugar.
Press chilled meat balls on griddle; cook 3-4 minutes each side.
Add cheese post-flip; move patties to cooler side once melted.
Toast Texas toast buns.
Spread sauce on bottom bun, add onions, patties, and bacon; top with other bun.