These White Wine Braised Leeks are an incredible side that are so good they may steal the whole show. Roasted so they're soft and spreadable, don't forget some crusty bread to soak up the irresistible sauce that's bursting with richness and flavor.
Prep leeks. Rinse. Use a knife to loosen one layer at a time and remove until most of the dirt is no longer visible. Then, cut off the green tops (cut where the leek begins to turn from white to green and the green tops sprout off). You won't be using the tops for this, but save them to add to soups and stocks).
Use a knife to loosen one layer at a time and remove until most of the dirt is no longer visible. Cut stalks into 1 - 2 inch chunks and submerge them in a bowl of water to remove the remaining grit. Set aside.
Make the sauce. In a saucepan over medium heat, add 2 tbsp of butter. Once melted add in the anchovies. As they cook, use a wooden spoon to break up into small pieces so they dissolve into the butter.
Remove thyme from the sprigs and sprinkle in the leaves. Then, add in the wine and bring to a simmer. Adjust heat to medium low.
Use a microplane to grate in garlic and then add the mustard. Stir and cook until fragrant, about 1 minute. Add in the heavy cream. Season with salt and pepper to taste.
Preheat oven to 325℉. Salt a buttered casserole dish. Add in leeks, standing up. Gently pour sauce over, topping with tarragon leaves and bay leaves.
Cover and bake for 40 minutes. Remove and bump heat up to 400℉. Return, uncovered, and bake for 15 more minutes.
To serve, drizzle the sauce over the leeks and use bread to soak it up.