When paired with dip and the main appetizer recipe in your spread, vegetables go surprisingly quickly! Plus it's much better to have extra than too little, so I suggest erring on the generous side. Estimate about 1 to 1 1/2 cups of vegetables per person, or about 4 to 6 ounces. Put any leftovers to use in Vegetable Casserole, Veggie Pizza, Vegetable Stock, or simply roast them on a sheet pan. (As far as the dip goes, 1/8 to 1/4 cup is a good guesstimate, but again, I suggest aiming high; extra makes for a tasty and healthy snack option for the next few days!)