- 2 cups white vinegar
- 1/2 cup sugar
- 2 tablespoons kosher salt
- 6 garlic cloves, halved
- 1 Fresno chile, thinly sliced into rings, seeded
- 1 pound button mushrooms, trimmed, quartered
- 1 tablespoon crushed red pepper flakes
- 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.