Add 2 cups of collagen-heavy pork stock to a soup pot.
Turn the heat up to high, and bring the stock to a simmer.
Reduce heat to medium-low.
Add the Worcestershire sauce, Dijon mustard, fresh thyme, and fresh rosemary to the pot and whisk to combine.
In a small bowl, stir together 2 Tbsp corn starch and 2 Tbsp cold water, and mix until combined.
When the stock is simmering, whisk in the corn starch and water mixture into the stock, and note how the sauce thickens.
If you prefer a thicker sauce, make some more of the cornstarch and water mixture and add it to the stock.
Taste your thickened sauce, and stir in the honey and sherry vinegar.
Remove the sauce from the heat.
Stir in the 4 Tbsp of cold, cubed salted butter, while the sauce is off the heat.
Stir until the butter is completely melted into the sauce.
Taste, and season with kosher salt & freshly-ground black pepper.
Add more honey or sherry vinegar if desired.
Gently warm up the sauce right before you are ready to serve.