Chilean Lomito Sandwich

pork roast, trimmed of fat

large carrots, cut into chunks

ribs of celery, chopped

onions, quartered

bay leaves

garlic smashed

oregano

kosher salt and fresh cracked black pepper

chicken stock, canned or homemade Food So Good Chicken

Stock Recipe:

water as needed

ripe avocados

large tomatoes, sliced

mayonnaise

cheese of choice (optional)

large semi soft rolls