Port-Rosemary Demi-Glace served with Crispy Pork Belly, Roasted Asparagus & Creamy Mashed Potatoes

Some sauces quietly become part of your everyday cooking, and this is one of mine.

I love how a simple pan sauce can completely transform a meal. This Port-Rosemary Demi-Glace is rich without being heavy and adds just enough elegance to make an ordinary dinner feel a little more special.

Whether I’m serving beef, pork, chicken, or even roasted vegetables, I rarely need more than a spoonful or two. The deep flavour comes from reducing port wine with shallots, garlic, fresh rosemary, and demi-glace until everything comes together into a silky sauce.

It’s simple to make and one of those recipes I find myself returning to again and again.

Start with garlic and shallots.

They create a gentle savoury base without overpowering the sauce.

Slice the shallots.

They soften beautifully and melt into the sauce as it cooks.

Cook slowly.

Sweat the shallots and garlic in butter and a little olive oil until softened but not browned.

Add the port wine.

Stir in the rosemary and reduce the wine until roughly three-quarters has evaporated. This concentrates both the sweetness and flavour.

Build the sauce.

Add homemade demi-glace (or a good quality store-bought version) and simmer gently.

Finish the sauce.

Whisk in small pieces of beurre manié (equal parts softened butter and flour) until the sauce lightly coats the back of a spoon.

My Recipe

Ingredients

Butter • Olive oil • 2 shallots • 2 cloves garlic • 1 sprig fresh rosemary • Port wine • Demi-glace (homemade or good quality store-bought) • Equal parts softened butter and all-purpose flour • Salt and freshly ground black pepper

Method

Heat a small saucepan over medium heat and add a little butter with a drizzle of olive oil.

Add the shallots and garlic and cook gently until softened without browning.

Stir in the rosemary and pour in the port wine.

Reduce the port until roughly three-quarters has evaporated and the flavour has concentrated.

Add the demi-glace and simmer gently until the sauce begins to thicken.

Combine equal parts softened butter and flour to make a beurre manié.

Whisk small pieces into the simmering sauce until it reaches your preferred consistency. I like mine just thick enough to coat the back of a spoon.

Taste and adjust with salt and freshly ground black pepper if needed. Remove rosemary and serve. If you want a smooth sauce, strain through a sieve to remove the shallots and garlic.

Notes

A good demi-glace is the foundation of this sauce. Homemade always gives the richest flavour, but a quality store-bought demi-glace works beautifully when time is short.

Don’t rush the reduction. Most of the depth comes from allowing the port wine to slowly concentrate before adding the demi-glace.

Remember that the sauce will continue to thicken slightly as it cools, so stop just before it reaches your ideal consistency.

I Use This With

This sauce pairs beautifully with:

Crispy Pork Belly
Beef Tenderloin
Ribeye Steak
Roast Chicken
Roast Pork
Lamb Chops
Duck Breast
Creamy Mashed Potatoes
Roasted Root Vegetables

What I Learned

A spoonful is all you need. A good sauce should enhance the meal, not overpower it.
Reducing the port first creates a deeper, richer flavour.
Homemade demi-glace produces the best results, but a quality store-bought version is an excellent shortcut.
Add the beurre manié a little at a time. It’s much easier to thicken a sauce than to thin one.
Straining the finished sauce is optional, but it gives the sauce a silky, restaurant-style finish.
I prefer the finished sauce to lightly coat the back of a spoon rather than become too thick.