Grilled Portobello Mushroom Burgers

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The onions:

1/4 cup white vinegar

1/2 teaspoon kosher salt

1/2 small red onion, thinly sliced

The mushrooms:

4 portobello mushroom caps, stems removed and gills scooped out

1/4 cup balsamic vinegar

2 tablespoons extra virgin olive oil + more for grilling

1 1/2 tablespoons soy sauce

1 teaspoon dried basil

1 teaspoon dried oregano

1 tablespoon minced garlic

-- Freshly ground black pepper to taste

4 brioche hamburger buns

8 leaves butter lettuce

1/2 cup crumbled feta cheese

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