Place the finely sliced red onion in a small bowl. Add the red wine vinegar and salt, then toss and leave to stand while you prepare the rest. (This gives you a quick pickle, softening the onion and rounding out its flavour.)
In a separate bowl, mix the cottage cheese with the lemon juice and grated garlic until well combined. Set aside.
In another bowl, combine the tomatoes, cucumber and olives. Lightly season with salt and pepper, drizzle with olive oil, then toss gently.
Spread the cottage cheese over a small serving dish in a thick, even layer. Spoon over the onion and its pickling juices, followed by the tomato mixture, letting the juices to soak into the cheese.
Finish with the dill and a final drizzle of olive oil. Taste and adjust the seasoning if needed.