Bring a large pot of water to a boil and lower the heat to a mild simmer. Crack the eggs over the boiling water and gently lower them in. Poach the eggs for 10-12 minutes. Check one at 10 minutes to make sure it's hard-cooked all the way through.
Allow the eggs to cool. Then remove the yolks and place them in a food processor. (Save the cooked whites for green salads or potato salad.) Place the yogurt, mayo, harissa, honey and dijon in the food processor. Puree until smooth. Do not salt!
Scoop the filling into a plastic zip bag. Snip the corner of the bag off and pipe the filling evenly into the Athen Mini Fillo Cups. Sprinkle with sumac, mint and capers. Serve immediately.