Like magma and dreams, frozen custard is a semisolid—neither solid enough to build a house upon nor liquid enough to feed to a thirsty sparrow. Delight in delicious paradoxes with today’s Groupon: for $5, you get $10 worth of frozen custard at the Custard Factory in Norman.

The Custard Factory whips up scoops of frozen custard in a chilly array of satisfying flavors and coats them in more than 40 toppings, crafting specialty concretes and customizable desserts. Custard, a creamier and thicker version of ice cream, tickles tongues with frozen airless delight in the form of vanilla, chocolate, strawberry, or low-fat-vanilla custard concretes topped with peanut-butter cups and sugary toupees. Delve into icy concoctions such as the Love Machine, a creamy vanilla base festooned with strawberries, chocolate flakes, and minute indentations in the shape of Dean Martin's head ($4.09 for a regular). Old-fashioned specialty sundaes include the banana split ($4.99) or a Stormin' Norman sundae, which combines vanilla custard with pecans, hot fudge, and caramel ($4.99 for three scoops).