Combine patty ingredients and form 2 patties. Heat canola oil in a skillet over medium-high heat. Press patties in panko to coat on both sides. Gently place patties in pan and brown on both sides, keeping the inside of the patties medium rare.
To make sauce, saute mushrooms in butter for 2 minutes. Add remaining sauce ingredients and cook for 1 minute. Pour sauce over patties and serve as pupu or appetizer.