Andy’s key lime pie concrete is a thick, spoonable frozen dessert inspired by the custard-style treat served at Andy’s Frozen Custard. It blends vanilla frozen custard with bright lime, sweetened condensed milk, graham crackers, and a buttery pie-crust crumble for the tangy flavor and crunchy bits of key lime pie without baking a whole pie.
Ingredients
- 2 cups (about 300 g) vanilla frozen custard, slightly softened but still very cold
- 3 tablespoons (45 ml) sweetened condensed milk
- 2 tablespoons (30 ml) fresh key lime juice, or regular lime juice
- 1 teaspoon finely grated key lime zest, or regular lime zest
- 3 tablespoons (21 g) graham cracker crumbs
- 2 tablespoons (16 g) all-purpose flour
- 1 tablespoon (12 g) granulated sugar
- 1 tablespoon (14 g) unsalted butter, melted
- Small pinch of fine salt
Instructions
- Make the pie-crust crumble. Heat the oven to 350°F (175°C). Stir together the graham cracker crumbs, flour, sugar, melted butter, and salt until evenly moistened and clumpy. Spread the mixture on a small parchment-lined baking sheet. Bake for 5 minutes, until lightly toasted and fragrant. Let it cool completely, about 15 minutes; it will crisp as it cools.
- Chill the serving bowls. Put two small bowls in the freezer while the crumble cools, if there is room. This is optional, but it helps the concrete stay firm while you mix and serve it.
- Mix the lime base. In a chilled mixing bowl, stir the condensed milk, lime juice, and zest together. The mixture may thicken slightly as the citrus meets the milk; that is expected. Use freshly squeezed juice for a brighter flavor, and avoid adding extra juice all at once because too much liquid can make the dessert loose.
- Fold in the frozen custard. Add the cold custard and fold or stir firmly until mostly smooth. Work quickly and stop as soon as it is evenly combined. A few soft streaks are fine; prolonged mixing warms the custard and can make the finished concrete runny.
- Add the crunch and serve. Fold in about two-thirds of the cooled crumble, leaving the rest for the tops. Divide the mixture between the chilled bowls, sprinkle with the remaining crumble, and serve immediately with spoons.
Tips
- Choose a thick base. Frozen custard gives the dessert its dense, rich texture. If you cannot find it, use premium vanilla ice cream; the result will be a little lighter and less eggy-tasting, but still delicious. Let it soften only enough to stir, not melt.
- Use zest carefully. Grate only the colored outer peel of the lime. The white pith underneath is bitter. Key limes have a distinctive, floral tartness, but standard Persian limes are a practical substitute and work well here.
- Keep the crumble crisp. Cool it fully before folding it into the custard. Warm crumbs can soften the mixture, and adding all the crumble at once leaves none for a crunchy topping.
- Adjust tartness in small steps. If you prefer a more pronounced lime flavor, add up to another teaspoon of juice or zest. If you add juice, mix it into the condensed milk first and keep the amount modest so the concrete holds its shape.
Serving Suggestions
Serve the concrete as soon as it is mixed, in small chilled dessert bowls or sturdy glasses. The crunchy graham topping and cold, tart custard are the point, so there is no need to let it stand. For an extra pie-like finish, add a small spoonful of whipped cream and a thin curl of lime zest. A few extra graham crumbs on top add texture without making the dessert overly sweet.
This recipe makes two generous servings, but it can be divided into four smaller portions after a rich meal. If serving a group, bake the crumble ahead and keep it in an airtight container at room temperature; mix the custard shortly before serving so it remains thick.
Variations
More pie crust: Increase the crumble ingredients by half and use some in the mixture and the rest as a generous topping. Keep the same baking time, checking that it is toasted but not dark.
Extra tangy: Replace the vanilla custard with a tart vanilla frozen yogurt, or add a little more lime zest. Frozen yogurt is often less rich and may soften more quickly, so serve it right after mixing.
Make it dairy-free: Use a firm, dairy-free vanilla frozen dessert and sweetened condensed coconut milk. The coconut adds a noticeable flavor and the texture may be less dense. Choose dairy-free graham crackers and a suitable butter alternative for the crumble.
Berry-lime: Fold in 2 tablespoons (20 g) of finely chopped fresh strawberries just before serving. Pat them dry first, since their juice can loosen the custard.
Storage and Reheating
This concrete is best eaten immediately. Because it is a frozen dessert, keep it frozen rather than leaving it at room temperature; return leftovers to the freezer within 2 hours. Store in a tightly covered, freezer-safe container for up to 1 week for best texture. The lime mixture and frozen custard can become icy or overly firm after freezing, and the graham crumbs will lose their crunch.
There is no reheating step. To serve a frozen portion, let it soften in the refrigerator for about 10–15 minutes, then stir briefly. Do not microwave it: uneven heating can melt the edges while the center remains hard. For the best result, reserve some crumble separately and add it just before serving.
Frequently Asked Questions
Is this the same as Andy’s Frozen Custard’s original recipe?
This is a home-style copycat inspired by the key lime pie flavor and concrete texture. The exact commercial formula is not provided here, so proportions and ingredients may differ from the shop version.
What is a concrete?
A concrete is a very thick frozen custard dessert mixed with flavorings or toppings. It is thicker than a typical milkshake and is usually eaten with a spoon.
Can I use bottled lime juice?
Yes, but fresh juice and zest usually give a brighter, more aromatic flavor. Bottled juice can taste sharper or flatter; start with 1 tablespoon (15 ml), taste the lime base, and add more only if needed.
Can I make it ahead?
You can bake and cool the crumble up to 3 days ahead and keep it airtight at room temperature. For the right thick texture, combine the lime base and frozen custard just before serving rather than preparing the finished concrete hours in advance.
Why did my concrete turn runny?
The custard may have softened too much, the mixture may have been stirred for too long, or extra lime juice may have thinned it. Chill the bowls, use very cold custard, and mix quickly. If it is already loose, freeze it for 15–20 minutes, checking often and stirring once when the edges begin to firm.
Can I make the crumble without an oven?
For a no-oven shortcut, use 5 tablespoons (35 g) of graham cracker crumbs mixed with 1 teaspoon melted butter and a pinch of sugar. It will be more like a buttery crumb topping than a baked pie-crust crumble, but it still adds crunch.
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