Combine 2 cups water with the einkorn berries in a large saucepan and bring to a boil. Lower the heat and simmer, covered, until the water has been absorbed, about 30 to 40 minutes.
Transfer the cooked einkorn to a serving bowl and allow to cool to room temperature.
Add the remaining ingredients to the bowl and stir to combine thoroughly with the einkorn. Allow to stand for a few minutes so that the flavors can blend, then serve. Or, you can refrigerate for an hour or so before serving.