10g is the usual weight of veg, if you wanted to be specific. It adds up to a lot even just then. 100g would be a piggies idea of a heavenly salad, admittedly.
I just throw their salad together so they each get a handful of mixed veg a day. Slice of pepper, one tomato, half a babycorn, 1cm chunk of apple etc. In terms of leafy veg - either half or one full leaf of lettuce, 2-3 sprigs of parsley etc. I give them as much coriander each as I can as this is their only staple veg that they are fed every day regardless of weekly menu changes. They usually get a full 80g packet of coriander between all 12 pigs.
10grams per veg, per pig... so in my case 30grams Red Pepper?