Soak einkorn (or spelt) berries for 4-24 hours. Before cooking, drain soaked berries through a very fine mesh strainer. Rinse well with cool water. Add soaked berries, 2-3 cups of water and salt to a medium pot. Bring to a full rolling boil. Cover, reduce heat, and simmer for 35-50 minutes (or more depending on how firm you like your berries). Drain in a fine mesh strainer and cool.
Combine berries, cucumber, tomatoes, onions, parsley and feta cheese in large bowl. Mix olive oil, vinegar and salt together and pour over salad. Mix well, and refrigerate for 1-2 hours before serving.