Grilled Onions and Mushrooms with Limed Sour Cream

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1 cup plain sour cream

1 tablespoon freshly squeezed lime juice

1 teaspoon lime zest

1/2 teaspoon kosher salt, plus more for seasoning

1/2 teaspoon freshly ground black pepper, plus more for seasoning

1 medium red onion, cut into 8 wedges

3 large portobello mushrooms, cut into 1-inch slices

Vegetable oil, for brushing the vegetables