Steamed Leeks Glazed with Crunchy Seeds | America's Test Kitchen

Ingredients

• 4 medium leeks , trimmed, soaked, and rinsed thoroughly (see illustrations below)
• 1 tablespoon red wine vinegar
• 2 teaspoons granulated sugar
• 1/4 teaspoon table salt
• 1/8 teaspoon ground black pepper
• 1 teaspoon yellow mustard seeds
• 1/2 teaspoon fennel seeds
• 1 teaspoon sesame seeds
• 3 tablespoons unsalted butter