Omas Bananenschnitte Se Nostalgie Grandmas German Slice

Ingredients

• 1 3/4 cups (220g) all-purpose flour, plus extra for dusting
• 1/2 cup (115g) unsalted butter, cold and cubed
• 1/4 cup (50g) granulated sugar
• 1 large egg yolk
• 2 tablespoons (30ml) ice water
• 1/4 teaspoon salt
• 3 ripe bananas, mashed
• 1/4 cup (30g) cornstarch
• 1 1/2 cups (355ml) milk (whole or 2%)
• 1 large egg
• 1 tablespoon (15g) unsalted butter
• 1 teaspoon vanilla extract
• 1 tablespoon lemon juice
• 1 1/2 cups (355ml) heavy cream, cold
• 2 tablespoons (25g) powdered sugar
• 1/2 teaspoon vanilla extract
• Cocoa powder, for dusting