It's simple. Peel the ginger, cut into cubes (you can grate).
Add soy sauce and lemon juice to ginger. Marinate in the resulting shrimp sauce for 30 minutes.
While marinated shrimp, a quarter of the mango cut into thin plates.
The same thing to do with avocado, after removing his skin. I spray it with lemon juice so it doesn't darken. If you bought too hard avocado, it does not matter. It should be wrapped in newspaper paper and left at room temperature for 2 days.
Prepare the sauce. Mix vegetable oil with balsamic vinegar and mustard. Put torn lettuce, avocado, mango and shrimp slices on a dish or salad bowl. Garnish with rings of red onion. Pour the sauce.