Bring water to boil in large pot. Add cabbage, celery, salt & caraway. Boil 5 min, drain well. Sauce: melt butter, add flour & cook, stirring 1 min. Slowly add milk in stream, stirring continuosly till sauce is smooth & thick. Add beer & continue stirring till foam disappears. Cook till heated through. Add cheddar, stir till melted. Season sauce with salt & pepper. Transfer to buttered 2 litre casserole and pour sauce over. Heat at 180ºC for 30 min. VARIATION: Can add chunks of cooked ham or corned beef to vegetables. SERVES:4