Minced flat-leaf parsley leaves and tender stems, for garnish
In a blender, combine the chicken stock, gelatin, fish sauce and Worcestershire sauce. In a large Dutch oven, heat vegetable oil over medium-high heat until shimmering. Season beef all over with salt, pepper and flour. Add to Dutch oven. Cook, turning occasionally, until beef is well browned on 2 sides, about 10 minutes. Remove from heat and set aside.
Lower heat to medium; add carrots, onion, celery, mushrooms and garlic to Dutch oven and cook, stirring occasionally, until lightly browned, about 4 minutes.
Preheat the oven to 300 degrees. Deglaze the pan with the red wine. Add the meat, sun-dried tomatoes and stock mixture to the Dutch oven. Stir to combine. Add the bouquet garni. Bake covered for about 2 hours or until the liquid has reduced to a gravy consistency. Add the peas and cook for 30 min.
Serve over mashed potatoes and garnish with fresh parsley.