Creamy Strawberry Banana Jello

Bahan-bahan (10 porsi)

• 1 6 -oz package Strawberry Jell-O
• 2 cups boiling water
• 24 ounces frozen strawberries (whole or sliced)
• 1 banana
• 2 tablespoons lemon juice
• 2 cups sour cream, light or regular
• fresh strawberries (to garnish (optional))