No-bake key lime parfaits offer a refreshing blend of tangy citrus filling, buttery graham cracker crumbs, and light whipped cream. Built in individual glass layers, this dessert requires zero oven time and relies on a natural chemical reaction between lime acid and condensed milk to set into a silky, cheesecake-like custard.
Ingredients & Component Breakdown
Component Breakdown
| Section | Ingredient | Quantity | Functional & Culinary Role |
| Crumb Base | Graham cracker crumbs | 1½ cups | Crunchy, toasted grain base (digestive biscuits work as an alternative). |
| Unsalted butter | 6 tbsp (85g), melted | Lipid binder that sets the crumb layer when chilled. | |
| Granulated sugar | 2 tbsp | Sweetens the biscuit crumbs. | |
| Key Lime Filling | Sweetened condensed milk | 1 can (14 oz / 400g) | Concentrated milk protein and sugar base. |
| Fresh key lime juice | ½ cup (120ml) | Acidic agent containing high citric acid levels; denatures milk proteins. | |
| Lime zest | 1 tbsp, finely grated | Essential aromatic citrus oil source. | |
| Pure vanilla extract | 1 tsp | Enhances sweet and floral notes. | |
| Whipped Cream Layer | Heavy whipping cream | 1 cup (240ml), chilled | High-fat dairy medium for micro-aeration. |
| Powdered sugar & Vanilla | 2 tbsp sugar, ½ tsp vanilla | Stabilizes and sweetens the cream layer. | |
| Garnishes | Lime slices / Zest / Mint | Optional | Visual accent and fresh surface aroma. |
Food Science: Acid Emulsification & Structural Setting
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Protein Thickening via Citric Acid: Key lime juice contains high concentrations of citric acid. When whisked into sweetened condensed milk, the low pH causes milk proteins (casein) to denature and cross-link into a thickened polymer gel. This eliminates the need for baking, eggs, or gelatin while producing a rich, spoonable custard base.
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Cold Fat Stabilization: Heavy cream whipped to soft-to-medium peaks introduces micro-aeration. Chilling the assembled glasses for at least 2 hours allows both the denatured casein matrix and the butterfat crystals in the cream to firm up into clean, distinct layers.
Step-by-Step Instructions:
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