Celery Root Fennel Gratin With Gruyere Recipe

• 1 lrg celery root about 1 lb., peeled and thinly sliced
• 2 x baking potatoes like russets, peeled and thinly sliced
• 2 x fennel bulbs thinly sliced
• 1/2 c. unbleached all-purpose flour
• 1/2 tsp salt
• 1/2 tsp freshly grnd black pepper
• 1 quart 2% low-fat lowfat milk
• 12 ounce lowfat Gruyere (or possibly Swiss cheese) shredded (3 c.)

Directions