Heat olive oil in a large, heavy pot over medium-high heat. Add the beef stew meat and sauté until browned on all sides, about 5 to 7 minutes. Add the garlic and cook for another minute.
2 tbsps. olive oil, 1-3/4 lbs lbs. stew beef, 7 large garlic cloves, finely chopped or crushed
To the same pot, add beef stock, red wine, Guinness beer, tomato paste, sugar, Worcestershire sauce, dried thyme, and bay leaves. Stir to combine, then bring the mixture to a boil. Reduce the heat to low, cover, and simmer for 2 ½ hours, stirring occasionally.
6 cups beef stock , 1 cup red wine, 1 cup Guinness stout beer, 3 tbsps. tomato paste, 1-1/2 tbsps. granulated sugar, 2 tbsps. Worcestershire sauce, 1 tbsp. dried thyme, 4 bay leaves
In another large pot, melt butter over medium heat. Add the potatoes, parsnips, onion, and carrots, sautéing until golden, about 15 minutes. Set aside until the stew has finished simmering.
2 tbsps. butter, 1-1/2 lbs. russet potatoes, peeled, cut to 1/2" pieces, 1 lb parsnips, peeled, cut to 1/2" pieces, 1 large yellow onion, chopped, 2 cups carrots, 1/2" pieces
Add the potato mixture to the beef stew and simmer uncovered until the vegetables and beef are tender, about 30 to 40 minutes. In a small bowl, mix cornstarch with 1 tablespoon of cold water until smooth. Slowly add to the stew, stirring for at least a minute until thickened. Discard the bay leaves and skim off any excess fat. Season with salt and pepper to taste.
1 tbsp. cornstarch , salt and pepper
Ladle into bowls, sprinkle with fresh parsley, and serve.
fresh parsley, chopped