Step 1: Onions ... Bring a small pot up to medium heat; and, saute the onions in the olive oil on medium heat until tender. Don't rush them, you don't want them to brown. Once they are tender, transfer to a small food processor along with the water, and puree until smooth. Return to the pot.
Step 2: Sauce ... Add the vinegar, ketchup, brown sugar, worcestershire sauce, mustard, a pinch of both salt and pepper to the pot with the onions; and mix to combine. Bring to a light boil; then, immediately reduce to low heat, and simmer for 15-20 minutes. The sauce will naturally thicken. Once the sauce has thickened (reduced), remove from the heat, and let it cool. Refrigerate at least a couple of hours before using. The sauce will keep up to 1 week in the refrigerator. I actually like to make this a day ahead if possible.
Step 3: Serve and ENJOY! ... Brush on steaks, chops, chicken, vegetables, etc. It is delicious, rich, and a great sauce. Use like you would a basic BBQ sauce. It's not quite as heavy; which I actually prefer; and, has a great tang to it.
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