Blend apricots in blender till smooth, or press through a sieve or food mill.
In saucepan combine sugar and cornstarch.
Stir in apricot puree, whipping cream, and lemon juice.
Cook, stirring constantly, till thickened and bubbly.
Transfer to fondue pot; place over fondue burner.
Spear cake cube or fruit piece with fondue fork and dip into fondue, swirling to coat.