I was doing a search for Greek Pizza and found out about Ladenia, there is a video on YOU Tube, search for Greek Pizza, then click on The Greek Pizza: Ladenia Recipe with llias Mamalakis.
This is what I got from the video : Mix 400 grams or (3 1/4 c), flour, 1 pkg. of yeast, 1 t salt, add 1 1/2 c warm water. Stir to make a dough. It will be soft, don't add any more flour. Cover and let rest 1/2 hour. Put 1/4-1/2 c olive oil in a 14" -15 "deep dish pizza pan. Put the dough in the pan sort of dimple it, Put red onion on first, then the tomatoes. Try to get all of the juice and seeds out. Sprinkle on some oregano and drizzle with olive oil on top. Bake at 400* for about 45 minutes.
There is a blog called Mediterranean Cooking in Alaska, that has a different recipe for Ladenia.