chop garlic mash to a paste with a pinch of salt \transfer to a small bowlstir in mayo,chives,dill,mustard,lemon juice,cayenne,pepper and salt to taste,set aioli aside in a food processor pulse the cubed bun into crumbs.set aside 1/2 of the crumbs for another use pulse the salmon until coarsely choppedabout 5 pulse.Transfer the salmon to a medium bowland stir in 3/4cup of the aioli,the reserved breadcrumbs salt and pepper.Shape into4 1-inch -thick patties. Heat 2 tbs ov butter in a 12-inch nonstick skilletover medium-high heat when melted but not smoking add the patties and cook till firm and crispabout 3-5-min per side meanwhile heat the broiler melt remaining butter brush on buns and brown.serve burgers on buns with remaining aioli and tomato and onion slices.