Brown speck in a large non-stick frypan over medium heat for 3 minutes or until the fat starts to render (melt). With a slotted spoon, remove and place in the slow cooker.
Cut steak into 5cm pieces. Season well. In batches, brown well on all sides in the remaining speck fat. Remove to slow cooker.
Place peeled whole eschalots in frypan and cook for 2 minutes or until golden on all sides. Remove to slow cooker.
Heat olive oil in frypan. Cook onion, carrots, celery and garlic over gentle heat for 3 minutes or until just a little caramelised. Add to slow cooker.
Return frypan to high heat. Pour in wine and allow to bubble up. Add stock, bring to the boil and pour over ingredients in slow cooker.
Wrap bay leaf and thyme in the orange peel and tuck it into the slow cooker.
Cook on a low setting for 6-8 hours, adding the mushrooms for the final hour.
Serve with mashed potato and steamed green vegetables.
Notes
If speck is unavailable, bacon will suffice.
You could also use blade or gravy beef instead of chuck steak.