Crab And Shrimp Au Gratin

• 38 resubmitted by marina
• 750 gr casserole dish
• 475 ml milk
• 240 ml milk
• 120 gr shrimp (cooked)
• 110 gr cheddar cheese
• 65 gr crabmeat
• 40 gr process cheese spread
• 32 gr all purpose flour
• 1 gr pepper