Spicy Garlic Pickles

Ingredients
Method
Bring vinegar, sugar, salt, and 2 cups water to a boil in a medium pot over high heat, stirring occasionally. Reduce heat to medium-low and simmer 10 minutes.
Place garlic, chile, mushrooms, and red pepper flakes in a heatproof resealable container or jar (divide among several containers if necessary). Pour hot brining liquid over mushroom mixture. Let cool to room temperature, then cover and chill at least 2 hours before serving.