How to Make It
Bring 3 1/4 cups water, vinegar, and salt to a boil in a large saucepan, stirring until salt dissolves. Add mushrooms; reduce heat, and simmer 6 minutes. Remove from heat. Add peppercorns and next 4 ingredients (through chiles); cool to room temperature. Place mushroom mixture in a 1-quart mason jar; top with olive oil. Seal tightly; refrigerate at least 24 hours before serving.