Leave the skin on your cucumber and slice it in half lengthwise. Remove the seeds and then slice it thin.
MIx everything in a large bowl and place in your fridge while you prepare everything else.
Avocado Mash:
Mix everything and taste to adjust heat or salt.
Crema:
Whisk together the ingredients.
Shrimp:
Pat your shrimp dry with paper towel. Season with spices and toss to coat. Heat the oil in a large skillet and cook the shrimp for about 2 minutes per side.