In a medium bowl, add shrimp, soy sauce, garlic, and red pepper flakes. The amount of pepper flakes is up to you, but remember, less is more! You can always add more at the end
Put the shrimp into the fridge to marinate. I usually marinate them for about 30 minutes, but in a pinch 10 minutes will do. Remove the shrimp from the fridge after 20 minutes, so they come back to temperature.
In a large skillet over medium-high heat, melt butter or margarine. When butter starts to foam, add shrimp and cook for about 2 minutes per side, until just cooked through. Do not overcook shrimp! Remove and set aside
Add marinade to skillet, turn heat to medium and cook down for 3-4 minutes
Add one piece of shrimp and a few pieces of diced avocado to each cup. Drizzle with soy sauce reduction, and finish with fresh basil and a squeeze of fresh lime juice. If desired, add a few more red pepper flakes