Clean, wash and cut the zucchini into thick slices. Peel onions and garlic. Dice onions, chop garlic. Clean, wash and finely dice the celery, bell pepper and tomato. Chop pecans. Heat 1 tablespoon of fat in a large pan and roast the nuts in it until golden brown.
Remove and put aside. Put the rest of the fat in the pan and heat it up. Add the zucchini, onions, garlic, celery, peppers and ham and braise for 8-10 minutes while stirring. Add tomato, braise briefly and season with salt and cayenne pepper. Mix breadcrumbs, parmesan and nuts and season with salt and pepper. Fold into the vegetables and serve immediately