Prepare the garlic mayonnaise by whirling the garlic cloves along with the parsley in a food processor until finely chopped. Add to the mayonnaise. Season to taste with salt and pepper.
Toast the bread however you like. I brushed mine with olive oil and toasted them on a grill pan.
Warm the shrimp. I used the grill pan after I finished with the toast.
Generously spread the herb mayonnaise on the toast and top with three shrimp.
Arrange on a tray and garnish with chopped parsley and sliced lemon as desired.