Is it gluten-free?
Personally I find the idea bizarre but haven’t tried it so I can’t say much more. I imagine a lot depends on how great a watermelon you get. Some watermelons are absolutely delicious and sweet. Some are bland as water. I am not sure which would be better in this case.
I did have a Pastrami Sandwich pizza once. Pizza pie, cheese, tomato sauce, pastrami and mustard. In theory it’s just an open face pastrami sandwich. It wasn’t bad, but I had trouble wrapping my head around mustard on a pizza.
As a kid, I grew watermelons one year on the lot next door. They were round about the size of volleyballs. They had a fairly dense texture, sweet taste, and were the perfect size for 4 brothers to eat one quarter each for a 10am snack. You didn’t want them at 3:00 pm because they were too warm then. ( This was in Longwood Fl, just north of orlando). Word got out and protecting the patch from poachers became a summer game, a whamo sling shot and dirt clods would scare off kids from the other blocks, friends were welcome to take any not marked with an X on them. Those were the ones we had picked out for weekend beach runs to New Smyrna Beach where dad would surf fish while we body surfed. 2-3 watermelons, canned drinks, and lots of ice in the big Coleman cooler. the station wagon was packed with 2-3 beach umbrellas, canvas floats, the big cooler, and the slightly smaller cooler for dads beer. Sandwiches PBJ, ham, turkey, tuna in the Tupperware in the cooler. boxes of cookies, a can of Charlies chips. we would leave in the early am and stay till 5 o’clock to be home in time for Disney and Ed Sullivan. We never thought of watermelon pizza, but we would have at least tried it. The good old days.