Drizzle the rusk with the olive oil. Use a grater to grate the tomatoes, into a colander and leave for 5 minutes to drain. Crumble the feta cheese with a fork, or grate it with a grater. To put the dish together, spread the grated tomato on the rusks and add the crumbled cheese. Sprinkle with the oregano and drizzle with some extra olive oil.