Place the baking sheet in the oven and roast the asparagus for 8 minutes. Remove from the oven and spoon the honey Gorgonzola mixture over the asparagus spears, then top with the chopped walnuts.
Onions aren't an unusual topping for a burger, but this combination of caramelized onions paired with Gruyère cheese adds new ... caramelized in the oven in a casserole dish covered with tin foil." ...