Use a dutch oven or large sauce pan. Pour 1/2 cup balsamic vinegar, water and garlic. Place a steamer basket in the bottom of the pan. It should elevate about 1/2 inch. If you have a steam pot with a steamer basket this will work too. In a pinch you can place a metal colander or strainer in the bottom of the sauce pan to suspend the food over the liquid. Bring to a boil.
Add potatoes and onions. Cover and steam for 10 minutes or until shrimp turn pink and start to curl.
Drizzle remaining 2 tablespoons balsamic vinegar over top and season as desired with salt and pepper. Gently toss the mixture, cover and cook an additional 1-2 minutes. Cooking times may vary depending on size of shrimp and the depth of pan.
Remove to a parchment lined baking sheet or table and dig in!
If you've tried this recipe, come back and let us know how it was!