Slow Cooker Beef Stew

https://www.delish.com/cooking/recipe-ideas/recipes/a49563/slow-cooker-red-wine-beef-stew-recipe/ 3 lb. beef chuck, cut into 2" pieces Kosher salt Freshly ground black pepper2 tbsp.  extra-virgin olive oil2 tbsp.  butter1 2/3 c.  dry red wine3 tbsp.  tomato paste2  Yukon Gold potatoes, cut into 1" cubes3  carrots, chopped into 1" pieces3  celery stalks, chopped into 1" pieces2  onions, chopped into quarters1 c.  chopped sun-dried tomatoes4  cloves garlic,