Short ribs are the meaty ends of the rib bones. Choose cuts from the chuck, which are the most flavorful, or from the rib, which are a bit leaner. Packages labeled "short ribs" in the supermarket are likely to come from the chuck. Start this recipe a day ahead. It will taste much better, and chilling the ribs in the cooking liquid will make the solidified fat easy to remove.
4 pounds beef short ribs, trimmed
1 teaspoon kosher salt, divided
1 teaspoon freshly ground black pepper, divided
2 cups finely chopped red onion
1/4 cup minced garlic (about 12 cloves)
2 cups low-salt beef broth
1 cup dry red wine
3/4 cup balsamic vinegar
1/3 cup packed brown sugar
2 cups chopped plum tomato
2 1/2 pounds baking potatoes, peeled and cut into quarters
3/4 cup warm 1% low-fat milk
2 tablespoons fat-free sour cream
1 1/2 tablespoons prepared horseradish
1 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
How to Make It
Preheat oven to 300°.
To prepare ribs, heat a large Dutch oven coated with cooking spray over medium-high heat. Sprinkle ribs with 1/2 teaspoon salt and 1/2 teaspoon pepper. Add half of ribs to pan; cook 8 minutes or until browned, turning occasionally. Remove from pan. Repeat procedure with remaining ribs; remove from pan.
Add onion to pan; sauté 8 minutes or until lightly browned. Add garlic; sauté 1 minute. Return ribs to pan. Add broth, wine, vinegar, sugar, and tomato; bring to a simmer.
Cover and bake at 300° for 1 1/2 hours or until tender. Cool slightly. Refrigerate 8 hours or overnight.
Skim fat from surface of broth mixture; discard fat. Cook over medium heat 30 minutes or until thoroughly heated. Stir in 1/2 teaspoon salt and 1/2 teaspoon pepper.
To prepare mashed potatoes, place potatoes in a large saucepan; cover with water. Bring to a boil; cook 20 minutes or until very tender. Drain. Combine potatoes, milk, and remaining ingredients in a large bowl. Mash potato mixture with a potato masher. Serve with ribs and cooking liquid.