What about homemade Ruska Salata? it's sold everywhere in Sofia, but in my opinion it has way too much mayonnaise sauce. The homemade one is worderful and much more healthier. And I usually replace the ham for tuna fish, delicious!
My recipe: boil separely eggs, green beans, peas, potatoes and carrots. Cut in dices and add tuna fish, and also tsarevitsa if you wish.