Check out the helpful ideas in notes below!
Preheat oven to 350. Set rack with space in middle of oven.
Heat dutch oven on medium high and sear all sides of the 3 lb boneless chuck roast (including sides if possible) for about 5 min per side, so all surfaces have a dark, almost charred color (not trying to render fats however). Set meat aside.
Heat 1 tbsp olive oil in the same dutch oven, with the leftover meat bits, on medium heat and add 1 ea medium onion, diced. Saute 5 min, to soften.
Add the roughly chopped 1 ea head of garlic and 6 sprigs fresh thyme with salt/pepper, stir and saute another 5 min.
Add the 6 oz tomato paste, stir on medium heat a few minutes until the paste starts to stick and caramelize.
Add 3 cups white grape juice, 3 cups water, and 1 tbsp tamari, stir, add in the seared piece of meat, cover and place in oven to cook for 3 hours.
After 3 hours, remove from oven, remove lid and using tongs, remove meat and place on a place.
Use two forks to shred meat - read next step carefully.
If eating right away, mix shredded meat into sauce, but if you can refrigerate overnight, store the cooked meat separate from the sauce, so that in the morning, you can easily spoon off the congealed fat from the top of ragu sauce (see photo in post), then add shredded beef to sauce and reheat.
As sauce and shredded meat reheat, drain and rinse beans, Wash and roughly chop kale/greens. Stir into pot with ragu and cook 10 minutes until greens are fully wilted and soft. Stir often, and add a bit of water if needed, to avoid sticking.