Krempita – Balkan Vanilla Custard Slices
380.02kcal
Ingredients
Pastry and Dusting
- 17.64 oz puff pastry thawed but cold; no alcohol or pork fat; weigh rather than count packages
- 0.71 oz powdered sugar for dusting just before serving
Vanilla Custard and Heated Egg-White Foam
- 4 1/4 cups whole milk US volume rounded; divide one-fifth cold and four-fifths for heating
- 6 large eggs US adaptation of German medium eggs; separate whites and yolks
- 5.29 oz granulated sugar custard portion
- 2.47 oz granulated sugar egg-white portion
- 3.53 oz cornstarch pure starch, not cornmeal
- 1.76 oz all-purpose flour US adaptation of German Type 405; not self-rising
- 0.56 oz vanilla sugar additional to the granulated sugar; weigh the product
- 1 vanilla bean split; seeds and pod used for infusion, pod removed
- 1/6 tsp fine salt US volume approximate; a small-quantity scale is more precise
Equipment
- Kitchen scale
- Metal cake pan 30 × 20 cm; at least 6 cm deep; leakproof
- Two baking sheets
- Parchment paper oven-rated for 400°F
- Rolling Pin
- Fork
- Serrated knife
- Heavy saucepan
- Heatproof bowl
- Small saucepan
- Hand mixer
- Whisk
- Silicone spatula
- Offset spatula
- Fine sieve
- Food thermometer
- Larger basin for ice-water cooling below the cake-pan rim
- Cooling rack
Method
- Prepare the pan. Line the specified metal pan with parchment, leaving lifting overhang on two sides. Preheat a conventional oven to 400°F (200°C). Set out a larger basin and ice for prompt cooling later. At enlarged settings, use one base-size pan per multiplier and work in separate base-size batches.
- Bake both pastry sheets. Divide the pastry equally into a bottom and a top for each cake. Roll each portion to about 12⅝ × 8⅝ inches (32 × 22 cm) on oven-rated parchment. Prick densely with a fork, cover with another parchment sheet, and weight with a second oven-safe baking sheet or rack. Bake each sheet for about 16–18 minutes until golden and fully baked, then cool completely on a rack. Repeat for the other sheet; allow extra baking rounds when scaling.
- Trim and pre-cut the top. Trim the cooled sheets to the pan's 30 × 20 cm interior. Put one whole sheet in the pan. Cut each matching top into a 3-by-4 grid before assembly; this gives one top piece per serving for a base-size cake. Keep the pieces in order. Do not mix trimmings into the custard.
- Separate and heat the whites. Separate the eggs individually. Put yolks in one bowl and whites in a completely grease-free heatproof bowl. Add the egg-white sugar and salt to the whites. Set over gently simmering water without the bowl touching it. Whisk continuously, sweeping the whole mixture, until a food thermometer registers at least 160°F (71°C) throughout; do not rely on appearance or the old lower-temperature criterion. Remove from heat and beat immediately to firm, smooth, glossy peaks. Do not continue heating into scrambled whites. Keep only briefly while finishing the custard.
- Infuse the milk. Reserve one-fifth of the milk cold. Split the vanilla bean and scrape its seeds into the remaining milk with the pod. Heat gently until just below boiling, then remove the pod.
- Make the yolk slurry. Whisk the yolks with the custard sugar and vanilla sugar for about 2 minutes. Add the cornstarch and flour, then gradually whisk in the reserved cold milk until smooth, with no dry pockets. Do not add dry starch directly to hot milk.
- Cook the custard fully. Slowly whisk the hot infused milk into the yolk mixture, then return everything to the heavy saucepan. Cook over medium heat, whisking across the base and corners, until thick and bubbling throughout. Reduce the heat and keep it gently bubbling for 2 minutes while stirring continuously. Check that the well-stirred custard has exceeded 160°F (71°C); thickening alone is not the egg-safety check. Remove from heat and immediately sieve out small lumps if needed, before adding foam.
- Fold and assemble promptly. Whisk about one-third of the heated egg-white foam into the still-hot cooked custard to lighten it. Fold the rest in two additions with a broad spatula, stopping when no large white patches remain. Immediately spread over the bottom pastry without pressing out the air. Set the pre-cut top pieces lightly in their original arrangement.
- Cool with temperature checks. Begin active cooling immediately in the prepared clean ice-water bath, keeping water below the leakproof pan rim and away from the cake. Refresh the ice and check the warmest central custard with a cleaned thin probe. Transfer promptly to a refrigerator at 40°F (4°C) or below, with space around the pan and only a loose protective cover. Starting the clock at assembly, reach 70°F (21°C) within 2 hours and 41°F (5°C) or below within 6 hours total; aim for 40°F (4°C) storage. Do not leave it on the counter for a fixed cooling rest. Discard if limits are missed or cooling history is uncertain. See the monitored-cooling notes.
- Chill and slice. Allow at least 6 hours in the refrigerator for the filling to set, in addition to meeting the cooling checks. Dust with the measured powdered sugar just before serving. Cut through the cream along the top-piece gaps, then saw gently through the base with a sharp knife. Wipe the blade between cuts and refrigerate remaining portions promptly.
Notes
- Use a leakproof metal pan measuring 30 × 20 cm (about 11¾ × 7⅞ inches), at least 6 cm (2⅜ inches) deep. Do not use a larger US 9 × 13-inch pan for the same amount. At 2x use two identical pans; at 3x use three. Prepare and cool each base-size custard batch separately rather than heating one oversized pot.
- The ingredient rows split the original granulated sugar between custard and egg whites so both portions scale. Vanilla sugar is additional; retain both it and the vanilla bean. Do not substitute liquid vanilla extract without separately adjusting the sugar and aroma. US ounces are weights; rounded volumes are approximate. Metric preserves the reference formula.
- Six US large eggs are a practical adaptation of six German medium eggs, approximately 300 g edible egg in the nutrition calculation. Separate carefully, with no yolk in the whites. The heated whites must reach 160°F (71°C) throughout before beating; raw foam is not made reliably safe merely by folding into hot custard.
- Start active cooling as soon as the cake is assembled. Use a leakproof metal pan in a clean ice-water bath below its rim, without wetting the pastry, and refresh the ice. Check the custard's warmest central area with a cleaned thin probe. Move promptly to a refrigerator at 40°F (4°C) or below, loosely covered and with space around the pan. Do not wait for room temperature or seal hot cake tightly.
- Using the FDA Food Code cooling benchmark, reach 70°F (21°C) within 2 hours after the center falls to 135°F (57°C), then 41°F (5°C) or below within 6 hours total from that point. For simpler conservative tracking, start the clock at assembly. Aim for storage at 40°F (4°C) or below. If a cooling limit is missed or the history is unknown, discard; a longer texture chill does not repair unsafe cooling.
- Chill at least 6 hours in the refrigerator for texture as well as meeting the measured cooling limits. The 7-hour-35-minute total is a base planning estimate; pastry cooling, active cooling, and extra pans can lengthen it. This exact tall cake's cooling curve and the heated foam have not been validated in a Balkan Feast kitchen trial. Confirm actual cooling by thermometer rather than assuming the timing guarantees it.
- Keep covered at 40°F (4°C) or below and use within 2 days as a conservative recipe limit, not a guaranteed shelf life. Keep total serving time outside refrigeration under 2 hours, or 1 hour above 90°F (32°C). Freezing is not recommended for the custard and pastry texture.
- Nutrition is an independent estimate per one-twelfth. It counts all measured pastry before trimming, all dusting sugar, milk at 1.03 g/ml, and 300 g edible whole egg. USDA composition is used for milk, eggs, and sugars; King Arthur all-purpose flour and Bob's Red Mill cornstarch labels are used. Campbell's Food Service Canada puff pastry data (390.7 kcal/100 g) is an explicit pastry proxy, not a claim about every US brand. Vanilla sugar is approximated as granulated sugar; the removed bean pod and its trace seeds are not quantified. Trimmings not eaten with the cake, brand fat levels, and portion sizes change intake.