Put the couscous and peas in a large bowl and add 1 1/2 cups boiling water. Stir to combine and then cover with plastic wrap. Set aside to steam for 5 minutes.
Uncover the bowl, fluff with a fork and set aside to cool, about 10 minutes. Toss in the mint, olive oil, lemon zest and juice, 1 teaspoon salt and 1/4 teaspoon pepper. Season with additional salt and pepper if needed. Sprinkle with red pepper flakes.
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