Lemon Blueberry Ricotta Crumb Cake with Buttery Streusel Step-by-step instructions

Before you start

Before beginning, ensure all ingredients are at room temperature, except for the butter used in the streusel. Preheat your oven to 350°F (175°C) and grease a 9-inch springform pan thoroughly to prevent sticking.

Have your zester ready for the lemon and ensure your berries are washed and patted completely dry to avoid adding excess moisture to the batter. Organise your workspace so that the streusel ingredients are separate from the cake batter components, allowing for a smooth and efficient assembly process once the oven is fully heated.

Instructions

Creating the Streusel

1. 1Prepare the Streusel
   Combine the cold butter, sugar, and all-purpose flour in a medium bowl. Use your fingers or a pastry cutter to incorporate the butter into the dry ingredients until large, coarse crumbs form. Keep the mixture chilled until ready to use to ensure the streusel retains its shape and crunch during the baking process.
   Look for Large, buttery crumbs should form without being fully blended into a dough.
   Tip Keep the butter cold for the best texture in the final streusel topping.

The streusel should look like a collection of large, coarse, and buttery boulders. The mixture should feel chilled and hold its shape when squeezed, but it should not be a uniform dough. If it looks too sandy, add a tiny bit more butter; if it looks like a single mass, add a pinch more flour to help maintain the distinct, irregular crumb texture required for the topping.

Mixing the Batter

2. 2Mix the Cake Base
   In a large mixing bowl, gently fold the ricotta cheese and lemon zest into the prepared vanilla cake batter until just combined. Carefully fold in the fresh blueberries, being mindful not to crush the berries, which keeps the cake interior bright and prevents the batter from turning purple or gray during the mixing stage.
   Look for The ricotta should be evenly distributed throughout the thick cake batter.
   Tip Folding gently ensures the cake remains light and the berries stay whole.

The cake batter should be thick, smooth, and heavily speckled with fresh, whole blueberries and small pockets of ricotta. Avoid over-folding the mixture, as the goal is to keep the ricotta and fruit distinct.

The batter should look vibrant and aromatic from the lemon zest, indicating that the flavors are properly incorporated without having been overworked or having the blueberries crushed during the folding process.

Baking the Cake

3. 3Assemble and Bake
   Pour the batter into a greased 9-inch springform pan and smooth the top. Sprinkle the streusel mixture generously over the surface, creating a thick, uneven layer. Bake at 350°F (175°C) for 50 minutes. The cake is done when a skewer inserted into the center comes out clean and the streusel is golden brown and crisp. Once baked, remove the cake from the oven and allow it to cool in the pan for 15 minutes before dusting with powdered sugar.
   Look for The streusel should be deep golden brown and the cake should feel firm to the touch.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip Allowing the cake to rest in the pan helps the structure set before serving.

The finished cake should be golden brown on top with a firm, crisp streusel layer. The cake will have risen slightly, and the aroma of toasted butter and lemon should be prominent. Check that the center is set and no longer jiggly. After the mandatory 15-minute rest in the pan, the edges should pull away slightly from the sides of the springform, indicating it is ready to be unmolded and served.

Common mistakes

A common mistake is overmixing the batter once the ricotta and berries are added; overworking the flour results in a tough, dense cake rather than a tender one. Another error is using warm butter for the streusel, which causes the crumbs to melt into the batter rather than staying distinct and crispy.

Finally, ensure the oven is fully preheated before putting the cake in, as a cold oven will cause the streusel to soften instead of crisping up properly during the initial baking phase.

How to tell it’s done

The cake is considered done when the streusel topping is a deep, golden brown and the cake itself has risen and feels firm to the touch. A cake tester or wooden skewer inserted into the center of the cake should come out clean, with no wet batter attached.

Given the inclusion of eggs in the batter, ensure the internal temperature has reached 160°F (71°C) at the thickest part of the cake to confirm it is fully cooked through and safe to enjoy.

• Egg dishes: 160°F (71°C) in the thickest part