Rinse deer heart in cold, running water to remove all blood. Trim off fat. Let stand in cold salted water to 1 to 2 hrs. Remove and place in a pot of boiling salted water. Boil 15 to 20 min. Remove and cut into 2 centimeter slices. Place in hot, oiled skillet. Sprinkle with steak spice, pepper and garlic salt. Fry like steak, both sides, about 15 min. In meantime prepare vegetables. Saute onions in oiled pot for 5 min, add remaining vegetables. Sprinkle with rosemary, thyme, garlic powder, and pepper. Dissolve bouillon in cup of hot water and add to vegetables. Simmer 10 min or to desired tenderness. Serve with deer heart and boiled or fried potatoes.