Mix marinade ingredients in a small saucepan. Warm just enough to melt honey. Pour over salmon pieces in a shallow dish and let marinate 1 hour, turning occasionally.
Preheat oven to broil or heat grill.
Put 4 chunks of salmon on each skewer. Place in baking dish in oven, or in a grill basket on the barbecue. Broil or grill 3 to 4 minutes; turn skewers and brush more marinade over the salmon. Cook another 3 to 4 minutes. Serve with prepared tzatziki sauce.