Ingredients

• 2/3 cup water
• 1 medium onion, chopped
• 2 tablespoons unsalted butter
• 1 pound frozen peas (3 1/2 cups)

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Instructions

1. Bring water, onion, and 1/2 teaspoon salt to a boil in a heavy medium saucepan, then cook over medium heat, covered, stirring occasionally, until onion is tender, about 5 minutes.
2. Increase heat to medium-high and stir in butter and peas, then cook, covered, stirring occasionally, until peas are tender, about 8 minutes. Season with salt.