Plethora of Tomatoes

Hopefully Dwight will find plenty of tomatoes at the local produce stand. For others, who have had a better crop this year, have you ever wondered what Mother's secret was to making tomato soup out of fresh tomatoes? There are lots of new recipes available, but this one might be worth trying.
Cream of Tomato Soup
1/2 can tomatoes (used bottled tomatoes)
1 qt. milk
1/4 t soda
1 t. salt
2 t. sugar
2 T butter
Boil tomatoes, add soda, rub thru sieve [Note: I don't remember Mother ever doing this???), and add to scalded milk; add sugar, salt, and butter. SErve immediately.