Dissolve Jello in hot water. Stir in juice from mandarin oranges (save 10 slices for top ... to Jello; add yogurt to Jello. Then cool 45 ... extra slices of oranges.
Drain pineapple, reserving juice. Add ... a boil. Dissolve Jello in boiling liquid. Refrigerate about 15 minutes. Whisk in yogurt and orange juice until blended. Stir in ... hours). Makes 10 servings.