Griddle the other veg, without oiling, until charred on each side and softening. As they cook toss them straight into the dressing, separating onions into rings. Peel peppers, reserving the juice in the bowl, deseed and cut into strips. Toss in with the rest of the veg, then strain the juice over. Leave everything to cool, then season. The salad can be kept in the fridge for 2 days, but bring it out a few hrs before serving. Then stir through parsley and garlic.