Vegetarian Sloppy Joes With Pickled Radish and Cucumber

Ingredients (15)

• 2 tablespoons olive oil
• 1 large onion, chopped
• 1/4 teaspoon red pepper flakes
• 1/4 teaspoon sea salt, or to taste
• 2 cups portobello mushrooms, chopped
• 1 red bell pepper, chopped
• 1 orange bell pepper, chopped
• 2 cloves garlic, chopped
• 1 tablespoon red wine vinegar
• 1/4 teaspoon brown sugar
• 1 cup cooked barley
• 1 (15-ounce) can sloppy joe sauce
• 5 to 10slider buns
• 1 medium pickled radish, sliced, for garnish
• 1 medium pickled cucumber, sliced, for garnish