How To Make Your White Wine Sauce Creamy Without Curdling - Tasting Table
Briefly

Chef Matthew Stowe from Joey Restaurants emphasizes the importance of technique in making creamy white wine sauce. To avoid curdling, he recommends adding white wine at the beginning using a roux or beurre manie. This method helps thicken the sauce without losing flavor. Additionally, for a gluten-free alternative, he suggests using a cornstarch slurry in place of traditional roux. The sauce starts with sweating shallots and garlic, creating a delicious base for various dishes.
I would actually add [white wine] at the beginning, [in] a roux or a beurre manie... that'll help thicken it and keep it smooth and it won't curdle.
Curdling is usually caused by over-reducing the cream... that's why the addition of a roux can be a better path to thicker sauce.
They [roux-based sauces] could be quite heavy... and a lot of times they kind of dilute flavor.
His trick is to replace the traditional roux with a cornstarch slurry, which is a mix of cornstarch and water.
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