This has become a summer staple at our house when tomatoes are in season. So easy to prepare, very impressive for guests. It IS a little messy, but the flavor combination is delicious. I do use a green olive tapenade and I include the capers, they add a perfect saltiness. We make it all the time. And it's incredibly filling.
I couldn't find the olive paste at my local grocery store so I had to make my own with a recipe I found. Although I am not a fan of green olives thats what I used and I really didn't have much experience with capers but quickly realized I wasn't a fan of the smell of them either I ended up liking the paste when combined with the rest of the sandwich ingredients everything turned out very well! I'd make again for sure.