No-bake Pineapple Cheesecake

• 12 graham cracker squares
• 10 place
• 1/2 egg (white)
• 300 ml non-fat vanilla yogurt
• 150 gr granulated sugar
• 90 gr non-fat cottage cheese
• 180 ml low fat cream cheese
• 45 gr grape-nuts cereal
• 45 ml lemon juice
• 30 ml fruit juice