Combine all the tzatziki ingredients in a bowl. Season to taste.
Add butter to a skillet and slice bagel. Cook for about 3 min or until it gets golden brown (you could also just toast it)
Make dill butter by combining softened butter in a small bowl with dill and a little Za’atar. Spread on bagel and then top with tzatziki.
Add smoked salmon, pickled onions and capers. Enjoy!