Combine lamb and herbs together. Let it marinade while preparing everything else.

In a small skillet melt butter and add red onions. Saute for about 10 minutes stirring occasionally.

Make tzatziki if not already prepared.

Make 8 small patties.

Oil a paper towel with the canola oil and wipe down the grill grates of outdoor grill or indoor grill pan several times to well coat with the oil. Heat over medium low.

Cook the patties 4 to 5 minutes per side, for medium doneness (longer if needed). Let the patties rest for 2 minutes.

Put each patty on bun, followed by a dollop of tzatziki sauce, feta, and a few onions. Place top bun on and serve.