Tropical Key Lime "Ice Cream"

I've had my Vitamix for about a year now and I've seen so many people use it to make ice cream out of frozen fruit (most commonly bananas). I've been skeptical, but last week I saw key limes at Publix and was inspired to make a healthy dessert out of them. Alas, this was the final product: thick and creamy ice cream consistency and amazing tropical flavors without milk, cream, or sugar!

2-3 key limes, juiced
1-1.5 cups frozen pineapple chunks
1/3-1/2 avocado, depending on the size
Handful of unsweetened coconut flakes
Splash of coconut milk to get it moving in the blender
Optional sweetener - a few drops of Stevia extract, 1/2 a frozen banana, or 1-2 tsp honey/agave

Blend everything in a high-powered blender until it reaches the desired consistency. I liked mine with a few coconut and pineapple chunks! *Note for best consistency, eat immediately. If you want to save it, freeze it and then re-blend it with a splash more milk to achieve a similar texture.