Don’t store at room temp. Most home made mustard recipes don’t have enough vinegar and salt to keep safely at room temp. To mellow out mustard quickly, heat up in microwave or on the stove. Bring to a bare simmer, turn off the heat, then let cool to room temp. put in a jar, and refrigerate. You may have to add a bit of water to thin it out after it cools to room temp.
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