Cebollas Encurtidas

Name: Cebollas Encurtidas
Yield: Makes 2 cups
Ingredients: 2 red onions, very thinly sliced; 1 teaspoon whole peppercorns, lightly crushed; 1 teaspoon allspice berries, lightly crushed; 1 teaspoon dried oregano; 1 teaspoon coarse salt; 1/4 cup white vinegar; 1/4 cup freshly squeezed lime juice