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Export 5 ingredients for grocery delivery
Whisk first 4 ingredients in heavy medium saucepan. Simmer over medium heat until mixture is reduced to 1/2 cup, about 12 minutes. Add stock and simmer until sauce is reduced to 1 1/4 cups, about 20 minutes. Whisk in butter 1 piece at a time, allowing each piece to melt before adding next. Season with salt and pepper.