Beat the yolks, lemon juice and sugar. Cook in a double boiler with constant stirring until thick.
Add the butter and cool. Drain the canned goods in a sieve thoroughly. Peel the orange, divide into segments.
Add to the drained fruits. Whip cream until volume doubles. Fold in with the fruits.
Add the cooled sauce. Transfer to a serving dish. Top with cherries and marshmallows.
Refrigerate overnight. Serves 6.