Chickpeas with Leeks and Lemon

Ingredients

• 1/4 cup extra-virgin olive oil
• 1 large garlic clove (, crushed slightly but whole)
• 1 6- inch branch fresh rosemary (, broken in two)
• 3 leeks (, cleaned, trimmed and with the white and light green parts sliced in 1/4-inch rounds)
• kosher salt
• 2 cups cooked chickpeas ((garbanzo beans))
• 1/2 lemon