Mix marinade ingredients together and add beef, coating evenly.
Place beef and marinade to food safe pouch and vacuum seal making sure beef is evenly distributed in the bag.
Put beef in Sous Vide Supreme. Beef will cook for 12-24 hours.
With 4 hours to go, cut broccoli tops from stems.
In a medium saucepan, heat 6 Tbs tallow on medium heat and saute broccoli tops and bell pepper for 5 minutes.
Remove vegetables from pan and place in a food pouch and vacuum seal making sure veggies are evenly distributed in bag.
Place veggies in Sous Vide Supreme and allow to cook for 4 hours.
With 10-15 minutes to go, dissolve arrowroot powder in chicken stock to make a paste and set aside.
In a saucepan, heat 1 tbs tallow on high heat and stir fry garlic for 30 seconds.
Reduce heat to medium and add arrowroot paste, coconut aminos, chicken stock, salt and pepper. Heat a few minutes until sauce thickens slightly. Turn heat off, but leave pan on the burner.
While sauce is thickening, remove beef and veggies from Sous Vide Supreme and add to the sauce. Stir all ingredients until evenly coated. Serve immediately.
Recipe by Pastured Kitchen at https://www.pasturedkitchen.com/recipes/sous-vide-beef-and-broccoli-stir-fry/