Squeeze the key limes by cutting them in half and squeezing as much juice out as possible. You could use a garlic press, ricer or regular handheld lemon squeezer. This creates approximately ½ cup of key lime juice.

Add the juice to a blender together with unsweetened almond milk, half a ripe avocado, ice, and a liquid sweetener.

Blend until smooth. Taste for sweetness and add more sweetener as required.

Serve immediately.