Mix all of the sauce ingredients together. Give it a taste. It should be a good balance of sweet and sour. If it needs more sweet, add more sugar, if it needs more sour, add more vinegar. Season well.

Pat brisket dry. This is a very important step. The beef needs to be very dry before it goes into the pan. If it is wet, it will steam instead of sear which is what you want. Season with salt and pepper right before you sear it. Crank up the heat in your pan and add a little oil. It needs to be screaming hot before the beef goes in. We are after a nice crispy crust on the outside of our brisket.

When both sides are seared put it in your roasting pan.

Pour the sauce all over the brisket.

Cover the brisket with the sliced onions.

Add a few sprigs of thyme and season with salt and pepper.

Cover with tin foil. I have a lid for this roasting pan. In fact, this is my favorite roasting vesicle, but my mom and my grandmother, and Rose Zawid, who made many, many of our Passover dinners always covered the brisket in tin foil. I do not mess with tradition. I do as I am told.

Put the brisket in a 300 degree oven. I hesitate to give an exact time as it depends on how large your brisket is. Mine was 3.5 pounds and it cooked for almost 3 hours. Brisket should be fork tender. If it is not fork tender, put it back in the oven until it is.

Let it rest a bit before you cut it. Slice on the bias against the grain. This is very important. If you cut with the grain, you will lost the texture of the brisket and it will be tough. This brisket was tender and succulent and all around delicious. This can be made a day ahead of time. In fact, I recommend that you do make it in advance. It will be even better the second day.