Frozen Rainbow Chiffon Cake

Ingredients

• vegetable oil cooking spray
• 1 1/2 cups blackberries (6 ounces)
• 1 1/4 cups blueberries (6 ounces)
• 1/2 cup plus 2 tablespoons fresh lemon juice (from 4 to 5 lemons)
• 10 large egg whites, room temperature
• salt
• 2 3/4 cups plus 1 tablespoon sugar
• 3/4 cup plus 3 tablespoons water
• 2 ripe papayas, peeled and seeded
• 3 kiwifruits, peeled
• 1 cup strawberries (6 ounces), hulled
• 1 1/4 cups raspberries (6 ounces)
• 1 can (15 ounces) apricots in juice, drained
• seven-minute frosting (recipe follows) seven-minute frosting