Roasted Cauliflower with Grapes

Toss 1 head of cauliflower (cut into 1 inch florets) with 1 1/2 cups grapes, 3 tbls olive oil, 2 tbls capers, 1 tsp each grated lemon zest and kosher salt, add pepper to taste.  Roast at 450F for 25 minutes.