Trim the ends off the onion as you did the pepper. Cut the outer layer of skin off, then trim one side with a shallow cut so that the whole onion sits stable on its side. Thinly slice the onion as you did the pepper, into 12 pieces. Slice the tomatoes in the same fashion as the onion, trimming off one side to stabilize it before slicing it across. Cut the tomatoes a little thicker, 6 slices per tomato. Season the tomatoes with a little coarse salt.
Strip the oregano leaves off the stems by holding stems at the top and gently pulling backward. Pile up the leaves on your cutting board and combine with the parsley leaves. Finely chop both, milling them together. To the chopped herbs, add the zest of the lemon. Trim the ends of the lemon and wedge it; reserve wedges. To the herb and lemon zest combination, add lots of fresh, coarse, black pepper -- at least a full teaspoon and up to 2. Mix it in with your fingertips.
Arrange the cheese slices in a single layer on your work surface and scatter the herb mixture over the cheese slices.
Pour a puddle of EVOO on each plate or on a serving paltter. Assemble stacks of Greek salad like this: sliced tomato, sliced onion, a layer of thin slices of cucumber, a slice of bell pepper, a slice of herb-crusted feta. Repeat twice. Each stack will have 3 layers, making a tower of Greek salad for each portion. Garnish each plate or the serving platter with olives and wedges of lemon.