Homegrown tomatoes do taste "really tangy and strong". Grocery store tomatoes were selectively bred to not be green around the stem because customers wrongly interpreted the green ring as unripe. In the process of selective breeding, tomatoes lost their natural flavor.
In the Southern US, there is a traditional Tomato Sandwich ( no bacon, no lettuce, no cheese), only white bread, mayonnaise, salt and pepper, and a thick slice of tomato. The flavor of the tomato is very powerful.