Wet the rusks and dry with a clean towel. Grate the tomato and combine with the feta. Spread on the rusks. Sprinkle with the oil, salt, oregano and a little grated onion, if using.
This recipe was provided by professional chefs and has been scaled down from a bulk recipe provided by a restaurant. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.