Heat the oil in a medium skillet over medium high heat. Add the shallots, rosemary, 1/2 tsp. salt, and 1/4 tsp. pepper. Cook, stirring occasionally, until tender, 2 to 3 minutes.
Add the wine to the skillet and cook over medium high heat until syrupy, 15 to 20 minutes. Add the broth an cook until reduced to 3/4 cup, 15 to 20 minutes more.
Meanwhile, in a small bowl, mash together the butter and flour with a fork. Reduce heat to medium and add the butter mixture to the skillet. Cook, stirring, until thickened, about 1 minute. Strain through a fine-mesh sieve.
Reviews
☆☆☆☆
To time with dinner I made the sauce early then heated to medium and added the flour/ butter when my meat was ready. Needed a little less flour that way. Delicious!
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