Sheet Pan Plum Cake with Crumble
When late summer bathes the orchards in rich purple and the scent of warm yeast dough, cinnamon, and melted butter fills the home, there is exactly one bake that draws everyone to the coffee table: A freshly baked plum sheet cake with streusel.
The scent of caramelised fruit juice combining with delicate butter streusel and fluffy yeast pastry evokes pure childhood memories. But anyone who has ever faced a soggy cake base or tough streusel knows that the seemingly simple art of the plum cake lies in the details. In this comprehensive guide, you will learn everything about choosing the right fruit, the secret to a sturdy yeast base, and the golden formula for outrageously crunchy butter streusel.
Late Summer on a Tray: Why the Right Fruit Makes All the Difference
At the farmers' market or in the fruit section, the selection seems huge, but when it comes to traditional plum crumble cake, there is a clear favourite among stone fruits. Anyone who equates round plums with Zwetschgen often gets a watery surprise in the oven.
Plums are round, wonderfully juicy, and have soft, sweet flesh. However, this abundance of juice is the biggest hurdle when baking: plums release huge amounts of water in the oven, which can make the base soggy and the crumble topping mushy.
The true Zwetschge, on the other hand, is the elongated subspecies of the plum. Its flesh is noticeably firmer, has a delicate, aromatic acidity, and above all a significantly lower water content. When baked, it holds its shape and is also effortless to pit.
True Zwetschgen
Oval-shaped with pointed ends, dark blue to violet skin, and a whitish waxy bloom. The flesh is greenish-yellow and firm. Separates almost effortlessly from the stone when cut and keeps the dough base wonderfully juicy without soaking it.
Round Plums
Spherical with a pronounced longitudinal groove. Extremely juicy, sweet, and soft. Perfect for snacking or making velvety plum butter. For sheet cakes, they should only be used if thoroughly drained beforehand and lightly dusted with cornstarch.
Foolproof yeast dough: Gently kneaded, risen golden yellow
A real plum cake calls for a traditional yeast dough. It provides the perfect contrast of soft fluffiness, delicate melt, and sturdy support for the juicy fruit. With the right steps, yeast holds no fear.
The secret to an elastic dough lies in using the right flour. While classic Type 405 works well, strong wheat flour Type 550 with its higher gluten content provides a more stable gluten structure that effortlessly supports the juicy fruit.
Yeast likes it cozy: The milk should never be warmer than 36 to 38 degrees, as yeast cells die above 40 degrees. A splash of lukewarm milk, a teaspoon of sugar, and fresh yeast are all it takes to gently start fermentation.
Preparing the starter dough (Dampfl)
Crumble 25 g fresh yeast into 200 ml lukewarm milk, stir in 1 tbsp sugar, and let the mixture stand in a warm place for 10 minutes until fine bubbles form.
Knead thoroughly
Add 500 g flour, 75 g soft butter, 1 pinch of salt, and 1 egg to the starter dough. Knead the dough for at least 8 to 10 minutes by hand or with a stand mixer until it is velvety smooth and pulls away from the sides of the bowl.
Relaxed resting phase
Cover the bowl with a slightly damp cloth and let the dough rise in a warm, draft-free place for about 45 to 60 minutes, until it has doubled in volume.
The protective shield against moisture
Roll out the dough on the greased baking sheet. Now sprinkle 2 to 3 tablespoons of semolina, breadcrumbs, or ground almonds thinly over the dough base before topping with the fruit. They absorb excess juice and guarantee a crispy base.
Streusel Perfection: The 3:2:1 Formula for Extra-Thick Crumbles
A plum cake without streusel is like late summer without sunshine. Only the buttery crunch makes the flavor experience complete. But how do you make streusel that doesn't melt into a flat, greasy dough during baking, but remains wonderfully chunky and crispy?
The 3 Golden Laws of Streusel:
1. Use ice-cold butter: Cut the butter into small cubes straight from the refrigerator. Warm or liquid butter leads to tough dough, while cold butter creates delicate layers and crunchy crumbs.
2. Only rub briefly between your fingertips: Do not knead the ingredients into a single lump. Rub the flour, sugar, and butter quickly with your hands or dough hooks until lumps of various sizes form.
3. Chill before baking: Place the prepared streusel in the refrigerator for at least 15 to 20 minutes while the yeast dough rests. Thanks to the cold shock, they keep their shape in the hot oven and do not melt.
