Slow Cooker Corned Beef

Name: Slow Cooker Corned Beef
Prep time: 10 min
Cook time: 8 h
Total time: 8 h 10 min
Cuisine: American
Ingredients: 1 corned beef brisket (, 3-4 lbs); 1 onion (, chopped); 3 carrots (, chopped); 3 stalks celery (, chopped); 2 garlic cloves; 2 cups beef broth; 1/4 cup tomato paste; 3 tablespoons Worcestershire sauce; 2/3 cup brown sugar; 1 teaspoon celery seeds; 1 dash red pepper flakes; 1 tablespoon salt; 1/2 tablespoon fresh cracked pepper; 1 bottle dark beer; 2 cups mayonnaise; 1/2 cup ketchup; 1/2 cup chili sauce; 1/4 cup sweet pickle relish; salt and pepper to taste; 1 package slider buns; 1 package Swiss cheese slices