A technique used to gently combine a light, airy mixture (such as beaten egg whites) with a heavier mixture (such as whipped cream or custard). The lighter mixture is placed on top of the heavier one in a large bowl. Starting at the back of the bowl, a rubber spatula is used to cut down vertically through the two mixtures, across the bottom of the bowl and up the nearest side. The bowl is rotated a quarter turn with each series of strokes. This down-across-up-and-over motion gently turns the mixtures over on top of each other, combining them in the process.