Fresh fava beans are a seasonaltreat; the arugula pesto addspunch.
Bring a saucepan of water to a boil. Prepare an ice-water bath; set aside. Boil fava beans 2 to 3 minutes; plunge into ice-water bath. Slip off skins. Process arugula, oil, cheese, lemon juice, and salt in a food processor until smooth. Toss with beans, and season with pepper. Spoon mixture onto bruschetta slices. Top with cheese shavings, and drizzle with oil.