Sweet Pepper and Onion Salad

1 1/2 pounds sweet peppers thinly sliced into rings
1 small onion thinly sliced into rings
2 tablespoons Sherry vinegar or red wine vinegar
Kosher salt freshly ground pepper
2 cups mixed fresh herbs finely chopped (basil, green onions, parsley, cilantro, mint, oregano, dill etc.)
2 tablespoons olive oil

Toss sweet peppers, onion, and vinegar in a large bowl; season with salt and black pepper.
Let sit until sweet peppers are slightly softened, 10–20 minutes.
Just before serving, toss herbs and oil with sweet pepper mixture.