For the record, and before someone @’s me for suggesting otherwise, this soup is technically not a gazpacho–it’s what you called a salmorejo. But it is gazpacho adjacent, with many of the same key ingredients but the inclusion of lots of vegetables. And, I mean, gazpacho–it’s just a lot of fun for your bubbling youngster to say.
But let’s talk about the add-ins, because they not only make the soup but also make it something closer to a meal. Ricotta (or whatever soft cheese you choose) adds creaminess, and depth; the addition of bread gives the soup its thicker, deeper texture. The hard-boiled egg on top, a nod to how things are done in Spain, provides some different textures and fun, and more protein to boot. You can, of course, remove these components and serve a chilled mostly-tomato soup; this one just eats more like a meal.
If your child prefers a thinner texture, add some broth to the bottom of his/her bowl before pouring in the soup; mix with a spoon to meld. Shred the egg over the top and serve to your child; add some toast or grilled cheese points for dipping, too. (Note: though eaten cold, feel free to heat up if your child prefers it warm.)
While a sandwich slice will work just fine as the bread component to the soup, know that you can put to use most any breadstuff lying around: baguettes, buns, crackers, etc. (Fun fact: the gazpacho in the recipe's image was actually made with three matzo and not bread.)