Whisk together 1/2 cup white vinegar, 1/4 cup sugar, 1 tsp. kosher salt, and 1/4 tsp. freshly ground black pepper. Add 1/2 head green cabbage (about 1 lb.), grated, and 1/2 cup chopped celery; toss to coat. Let stand 1 hour before serving, tossing occasionally. Serve with hot sauce.