Pastel de Nata
Portuguese custard tarts: a spiral of puff pastry pressed into a muffin tin, filled with a lemon-and-cinnamon custard and blasted in the hottest oven you have until the tops blister black. Shop-bought pastry gets you most of the way; the custard is where the recipe actually is.
At a glance
Ingredients and method are in the app
Kitchen Pantri holds the full ingredient list and step-by-step method for Pastel de Nata, checks it against what is already in your pantry, and adds anything missing to your shopping list. The app is free to use; you set up a Pantri account when you first open it.