4 slices onion, 3/4 to 1 inch thick
2 tbsp. butter, melted
Salt
2 tsp. brown sugar
2 tbsp. chopped walnuts

Preheat broiler. Brush onion slices with half of the melted butter. Broil until lightly brown, about 5 minutes. Turn onions. Sprinkle with salt, sugar, and nuts. Drizzle remaining butter over onions. Broil until sugar is melted and onions are crisp-tender, about 3 minutes.