The delicious, crumb-topped asparagus casserole features a simple white sauce with cheddar cheese. The recipe calls for frozen asparagus, but fresh can be used. Boil or steam the asparagus until just tender and then proceed with the recipe. Pimiento adds some color to the dish, but we sometimes add diced roasted red bell pepper if we don't have the pimiento. Or replace the pimiento with canned mushrooms or sauted fresh sliced mushrooms.