Potato soup is a long time favourite at our house. Have added a good number of potato soup recipes to our family cookbook over the years - none have had the beef soup base. Have to admit I really hesitated and kept thinking chicken for the base! But followed through - the result unlike the potato soups I've made - you just can't go wrong with anything that tastes like mashed potatoes and gravy! Can't verify zhapashka either but what ever the name - it is a great tasting soup and one that will be seeing repeats at our house. Thank you for sharing your mom's recipe. Made for My-3-Chefs.