At least 1 hr before cooking, pour the beer into a shallow bowl until it becomes flat.
Dry the bread cubes on a baking sheet in a 300 deg oven until they are crisp but not browned, about 15-20 min.
Saute the cauliflower in the butter with the carraway seeds until just barely tender.
Combine the bread cubes and cauliflower with grated cheese.
Spread the mixture into buttered 3-qt casserole dish.
Mix the eggs, mustard, coriander, and black pepper together with the flat beer. Pour the mixture into the casserole dish.
Bake at 350 deg. for 35-45 min. until puffed and golden.