Preheat your oven to 325°F (163°C).
Trim any excess fat from your beef shoulder roast if necessary, then cut it into four large pieces or leave it whole if it's bone-in. Drying the meat with paper towels helps achieve a nice sear.
Generously season all sides of the beef pieces with kosher salt and freshly cracked black pepper. In a large dutch oven, heat neutral oil over medium-high heat until shimmering, then add the beef in batches, searing for about 4-5 minutes per side until browned deeply.
While searing, whisk together apple cider, chicken stock or broth, dijon mustard, and dehydrated minced onion in a bowl until well combined. Use kitchen twine to bundle your rosemary and thyme sprigs together for easy removal later on.