Pat dry shrimp with a kitchen towel or paper towel.
In a large bowl, mix shrimp, oil, onion, garlic, lemon juice with seasoning mix.
Heat a large pan over medium high heat until it smokes hot. Add shrimp mix in the pan and sear. Let shrimp cook until nicely browned/blackened on both sides. It will take about 3 minutes. Remove from heat.
Prepare your bowl by starting with the lettuce as base then build your bowl with the other ingredients. Add shrimp last.