Aunt norma's fruit ambrosia recipe

Ingredients

• 2 cans Dole pineapple chunks unsweetened (drained, save juice for sauce)
• 2 cans mandarin oranges (drain, throw away juice)
• 2 cups green or purple seedless grapes
• 1/2 cup reserved pineapple juice (unsweetened)
• 1/3 cup lemon juice
• 1/2 cup sugar
• 1 egg (beaten)
• 6 bananas
• Whipped cream (optional)