Creamy Tomato Soup クリーミィトマトスープ

I get Campari tomatoes almost every week and prepare them by removing the skin. Then I keep them in the refrigerator which is very convenient to make a quick cucumber tomato salad or just add as a side. Often, we can’t use up all the tomatoes and my default is to make them into marinara sauce. This time since we already had a batch of marinara sauce which had been re-heated several times, I decided to make the excess tomatoes into a creamy tomato soup. I served the soup with macaroni salad (for the salad dressing I used mayo, Greek yogurt, Dijon mustard) and couscous salad, Campari tomato and a slice of baguette I made few days ago. I made this bread using biga made of rye flour and buttermilk (My wife prepared this for me). As a result, this baguette had a slightly different flavor which we really liked.

Ingredients:
5 Campari tomatoes, skinned, cut into small chunks
1 small onion, finely diced
1 small stalk of celery, finely diced
2 garlic cloves, finely chopped
1 tsp tomato paste
1 cup water/chicken broth (I used whey from the cheese curd my wife made recently)
1 tsp butter
1 tsp olive oil
1 tsp sodium bicarbonate (baking soda) (to reduce the acidity of the soup, optional*)
1/2 c heavy cream

*Digression alert: If tomato sauce or soup is too acidic, the most common suggestion is to add a small amount of sugar. This may mask the acidic taste but does not reduce the acidity (or does not raise pH). Adding sodium bicarbonate does reduce the acidity. My understanding is that tomato’s acidity mainly come from oxalic acid. So, the addition of bi-carbonate will produce carbon dioxide (CO2 gas), water (H20) and sodium carbonate (Na2CO3). Reportedly, the resulting sodium carbonate may give rise to a “bitter” and “soapy” taste but I have not experienced this. I have found that adding a small amount of sodium bicarbonate definitely makes these tomato containing dishes less acidic without negative effects in taste. The sodium ion from sodium carbonate in water may add some “saltiness” so the salt seasoning may have to be adjusted. It should be noted that when you add bicarbonate, the soup bubbles up for several minutes.

Directions:
Add the olive oil in a pan on medium heat. Add the butter and sauté the onion, celery, and garlic for a few minutes. Set the vegetables aside and add the tomato paste and sauté for 30 seconds (I use the type of tomato paste that comes in a tube, Cento tomato paste. It is much easier to use tomato paste from a tube when a small amount is needed compared to opening a whole can). Add the tomato and the liquid (I used whey). Cook 10-15 minutes until all the vegetables are cooked and soft. Using an immersion blender, make smooth soup. Season with salt and pepper.

(Optional) This process is to reduce the acidity. While it is simmering, add the sodium bicarbonate and mix (lots of bubbles come out, keep stirring for serval minutes until the bubbles subside.) I tasted the soup at this stage and it was very good without cream.

Since I was not planning to serve this immediately, I quickly chilled the soup by putting the pan in a large bowl with running water while stirring. Then I put it in sealable container in the refrigerator.

The next day, I served this for lunch. I warmed up the soup and added the cream. With an the addition of the cream, this became quite a luxurious soup.