For the filling, put a 2-quart pot on medium heat and add 1 tablespoon of olive oil, then add the celery, onion, and carrots. Sauté, stirring, for about five minutes, until the onion is golden. Add the buckwheat to the pan and stir until the buckwheat is hot, about 2 minutes. Add 1 1/2 cups water, thyme, basil, paprika and 1 teaspoon salt, and bring to a boil over high heat. Cover the pot and lower the heat to low. Cook, covered, for 20-25 minutes, until the water is absorbed. Take off the heat and stir in the chevre (if using) and almonds.