IIRC, a chef from a ritzy restaurant used to add sugar to the soil when transplanting. I have never tried it. Sometimes I eat tomatoes with salt and sometime I sprinkle sugar on them.
My Granny always sprinkled sugar on tomatoes to eat fresh. Most other people used salt.
Thank you. I enjoy a little salt upon mine at times.
The last 3 I picked are very sweet. I think the earliest tomatoes were just less sweet.