How to Make My Grandmother's Decadent Madeira Jus Sauce

Ingredients

• 1 cup (240 ml) Madeira wine
• 2 cups (480 ml) beef stock (preferably homemade or high-quality)
• 1 tablespoon (15 g) unsalted butter
• 1 tablespoon (15 g) all-purpose flour
• 1 medium shallot, finely diced
• 1 sprig of fresh thyme (or ½ teaspoon dried thyme)
• Salt, to taste
• Freshly ground black pepper, to taste
• Finely chopped fresh parsley (optional, for garnish)