Name: Blueberry Jam Pastry
Cook time: 18 min
Total time: 18 min
Yield: 6 servings
Ingredients: 400 g puff pastry, from the refrigerated section; 150 g blueberries (1 cup); 30 g sugar (2½ tbsp); 1 tsp cornstarch; 250 g quark or unsalted cream cheese (1 cup); 1 egg; 50 g sugar (¼ cup); 15 g cornstarch (1½ tbsp); some freshly ground vanilla (from a vanilla mill); zest of ½ lemon; 80-90 g fresh blueberries (½ ⅔ cup); a few thin lemon slices or small lemon wedges; powdered sugar for dusting

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FAQ

Blueberry Jam Pastry Questions

Why did my filling puff up and then sink in the middle?

That's totally normal here - the egg and quark mixture rises a bit in the oven and settles as it cools, so don't panic when you see it happen. As long as you baked it the full 18 minutes at 180C until set, the texture will be just right once cooled. Letting the tartlets cool completely before adding the jam helps everything settle nicely.

Can you use frozen blueberries instead of fresh ones for the jam?

Yes, frozen blueberries work fine for cooking down into the jam since they get cooked and sieved anyway, so you won't notice a difference there. For the fresh blueberries used as decoration on top, though, you really want fresh ones - frozen berries turn mushy and won't look as pretty. Just keep in mind frozen berries release more liquid, so you might need a touch longer to thicken the jam.

How long do these tartlets keep and how should you store them?

Since these have a quark and egg filling, you'll want to keep them in the fridge, and they're best enjoyed within 2 to 3 days for the freshest taste and texture. Store them in an airtight container so the puff pastry doesn't pick up fridge odors or go soggy. The powdered sugar dusting is best added right before serving rather than in advance, since it tends to dissolve into the filling over time.

Can you prebake the tartlet shells and make the jam ahead of time?

Absolutely, this recipe is great for prepping in stages - you can blind-bake the pastry bases and cook the blueberry jam a day ahead. Just let both cool completely and store the jam covered in the fridge, then assemble and bake the filling when you're ready. This takes some pressure off if you're baking these for a get-together.

What's the most common mistake when blind-baking the pastry bases?

Skipping the pie weights or not pricking the bases with a fork enough is the biggest culprit - without them, the pastry puffs up unevenly and won't hold the filling properly. Also watch that your molds are well chilled before you press in the pastry circles, since warm dough tends to shrink back during baking. If the edges brown too fast during the 15 minute blind bake, that's your cue the oven might be running a bit hot.