Beef Stew with Red Wine in Slow Cooker

I have read many Beef stew recipes and tried a few times. This came up to be a nice recipe. 

Tip : If the beef has strong smell, blanch the meat with coffee boiled 

https://www.jamieoliver.com/recipes/beef-recipes/insanely-good-oxtail-stew/

2.5 kg oxtail , chopped into 4cm chunks (ask your butcher to do this)

• 2 Tbsp olive oil
• 2 sticks of celery
• 4 medium carrots
• dash of thyme
• 2 Tbsp rosemary
• 4 fresh bay leaves
• 4 cloves garlic (whole) 
• 2 heaped tablespoons plain flour 
• 2 x 400 g tins of plum tomatoes (optional) - I did not use
• 275 ml porter or red wine (Marlot)
• 1 cube beef stock , optional
• Worcestershire 

https://www.giverecipe.com/beef-stew-in-clay-pot/

• 1 onion, chopped
• 3 tbsp olive oil
• 2 lbs boneless beef chuck, cut into 2-inch cubes
• 2 green peppers, chopped
• 4 cloves garlic
• 3 tomatoes, cut in rings
• 2 cups hot water
• ½ tbsp pepper paste
• 1 tsp salt
• A pinch of black pepper