- Reserve about 1/4 C of juice; mix with 1 Tbsp cornstarch. - Heat (but do not boil) remaining 1 C pineapple juice & 1/2 C orange juice in sauce pan. - Beat 2 eggs, then add 2/3 C sugar and the juice-cornstarch mixture. Slowly add some of the heated juice to increase temp and then add everything back to the saucepan. - Stir constantly as it cooks on low heat until it bubbles and becomes clear. Turn off heat. - Stir in 1 Tbsp lemon juice and 1 Tbsp butter. - While sauce is cooling, cut up fruit & combine in large serving bowl. - Pour chilled sauce over fruit and mix well. Chill until served.