Dice the carrots, celery, and onion. Set aside. TIP: you can find these already diced in most grocery stores and sometimes already in a combined container labeled as Mirepoix!
Open the can of whole peeled tomatoes and break them up either with a fork in a bowl or with your fingers, squeezing them gently to crush and break up. Set aside.
To a preheated skillet, add the diced pancetta and cook down until the fat renders about 5-6 minutes. Then scoop the pancetta out with a slotted spoon or spatula and put into the slow cooker.
To the fat in the pan, add the ground beef and break it up with a spatula. Let the meat sear and get brown, then stir to brown on all sides. When the meat is done cooking, transfer it to the slow cooker.
Next, add the carrots, celery, and onion to the skillet. Add a little olive oil if needed. Saute for 5 minutes until they start to sweat and soften.
Add the garlic and red wine and cook down for about 3-4 minutes. Then transfer to the slow cooker.
Finally to the Slow cooker add: The demi-glace, tomato paste, crushed tomatoes, Italian Seasoning, Bay Leaf, Salt, and Pepper to taste.
Now...this is the point that you can cover and place the entire slow cooker pot in the fridge until the day you want to cook it OR just cook it now for 6-8 hours. If you cook on a Sunday you can either eat it or save it in the fridge and reheat it on the stove during the week.