Moscow Mule
Vodka, fresh lime and ginger beer over ice. Three ingredients and one thing to get right at the shop: ginger beer, which is not ginger ale, and is the entire flavour of the drink.
At a glance
Ingredients and method are in the app
Kitchen Pantri holds the full ingredient list and step-by-step method for Moscow Mule, 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.