Hearty Slow Cooked Beef Stew Recipe

2 pounds beef stew meat

trimmed and cut into 1-inch cubes

1 (15 ounce) can new potatoes

drained and quartered

1 onion

chopped

1 cup chopped carrot

1 (8 ounce) can tomato sauce

1 cup water

1 cup dry red wine

2 beef bouillon cubes

1 (1 ounce) package dry onion soup mix (such as Lipton®)

1 teaspoon dried rosemary

1 teaspoon garlic powder

1 teaspoon salt

1 pinch ground black pepper

2 tablespoons cornstarch

3 tablespoons cold water