Short Ribs With Cabbage

Ingredients

• 2 tablespoons olive oil
• 4 lbs short rib of beef, cut into serving pieces
• kosher salt or sea salt, to taste
• black pepper, to taste
• 1 cup beef stock or 1 cup beef broth
• 2 teaspoons dry mustard
• 1/2 cup red wine vinegar
• 1/2 teaspoon dried oregano
• 1 small onion, sliced (about 1/2 cup)
• 1 head cabbage, cut into weges