Cut the lids off the peppers, pull out the seeds, then sit the lids and bases directly on the bars of the oven to start softening.
Meanwhile, finely chop the ham and place in a large non-stick ovenproof frying pan on a medium heat with 1 tablespoon of olive oil, stirring regularly while you peel and finely chop the onion.
Once the ham is crispy, stir in the onion and cook for 5 minutes, or until softened, stirring regularly.
Add 1 tablespoon of red wine vinegar, then pour in the beans, juice and all.
Remove the peppers from the oven and nestle the bases into the stew.
Divide the grains and a little feta between them and sit the pepper lids ajar.
Transfer to the oven for 20 minutes, or until the peppers are cooked through, then season the stew to perfection.
Halve, destone, scoop out and dice the avocado, then toss with the juice of 1 lime and a pinch of seasoning.
Spoon the avocado over the cooked peppers, crumble over the rest of the feta, and serve with lime wedges, for squeezing over.