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Export 5 ingredients for grocery delivery
Step 1
In a small saucepan with a lid, melt butter over medium heat until it foams. Add shallots, thyme and pinch of salt. Cook, stirring, until shallots are soft and fragrant but not brown, 3 minutes. Add stock and plums; bring to boil. Turn off heat, cover, and let stand 10 minutes to plums soften.
Step 2
Pour into a food processor, add mustard and vinegar, and process until smooth.