Put a large pot over high heat, and when hot, add the oil. Add the onion and sauté, lowering the heat when the onion starts to brown. Cook for an hour if you can; longer cooking will bring out the onion's sugars. Add the beets, carrots, and celery and keep stirring for about 5 minutes.
Add the caraway, apple juice, 3 cups water or stock, and the beet greens and bring to a boil. Once boiling, lower to a simmer and cook until the beets are very tender, about 10 minutes. Add 1 teaspoon salt, dill and vinegar and simmer for another 5 minutes.
For the garnish, stir the yogurt with the parsley and 1/4 teaspoon salt.
To serve, ladle a cup of the soup in a wide bowl, then put in 1/4 cup portion of buckwheat in the center and a tablespoon of the yogurt mixture on top. Serve immediately.
Nutrition information p`er each of 8 servings:
Calories125Fat3 gSodium480 mgCarbohydrates23 gSaturated fat1 gCalcium93 mgProtein4 gCholesterol1 mgDietary fiber4 gDiabetic exchanges per serving: 1 vegetable, 1 bread/starch, ½ fat.