If using ground pork, follow same instructions as ground beef.
If using 20 oz. ground beef, follow same instructions as 10 oz. ground beef in Step 3, forming into four 4”-diameter patties. Follow same instructions as 10 oz. ground beef in Step 4. If desired, halve cheese slices to cover four patties and serve burgers as double-deckers.
If using Impossible burger, follow same instructions as ground beef in Steps 3 and 4, cooking until burger is heated through, 4-6 minutes per side.
If using steak strips, separate into a single layer and pat dry. Follow same instructions as ground beef in Step 4, stirring occasionally until no pink remains and steak reaches minimum internal temperature, 4-6 minutes. Add cheese in Step 5 before caramelized onions.