Mix the oil with lemon juice, zest and the crushed garlic clove in a small bowl. Let it rest for 20 minutes so the flavors mix well. Stir once in a while with a spoon.
Heat up a frying pan (cast iron preferably) so it’s hot. Now add the shrimp and fry them in the dry pan for 1 minute.
Turn off the heat completely and flip the shrimp over, and fry them for 1 more minute.
Add the oil/lemon mix and stir real quick, then serve it with the avocado. Make sure you spoon over any left over oil/lemon mix from the frying pan.