Yes, indeed. Tomato and onion salad has always been popular here. However, when I make myself sandwiches for school brunch/lunch, I use tomato without onion. What about you? Do you eat onion in the morning or during working hours? :):)
I almost never see tomatoes without onion in Poland
Whenever I see this combination, I recall one day when I was young and our housekeeper left and there was nobody to cook for us coz parents worked long hours. So they gave us some money and for a few days we visited milk bars and dined there. I remember it like today that on the first day I fancied tomato and onion salad. I expected the worst coz I had heard bad opinions about milk bars before. yet the stuff on the plate was very appealing - fresh, nicely served, well seasoned. I was really surprised.
I will never forget that salad.