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Soak the buckwheat overnight in cold water. The next day, drain and rinse the buckwheat. Put the dates in a pan with 300ml water and the cinnamon, and blitz with a stick blender until completely smooth. Add the buckwheat, bring to the boil and cook, uncovered, for 5 mins until pulpy. Meanwhile, heat oven to 150C/130C fan/gas 2 and line two large baking trays with baking parchment.
Stir the oats and oil into the date and buckwheat mixture, then spoon small clusters of the mixture onto the baking trays. Bake for 15 mins, then carefully scrape the clusters from the parchment if they have stuck and turn before spreading out again. Return to the oven for another 15 mins, turning frequently, until firm and golden.
When the mix is dry enough, tip into a bowl, mix in the seeds and nuts with the sultanas and toss well. When cool, serve each person a generous handful with yogurt and fruit, and pack the excess into an airtight container. Will keep for a week. On other days you can vary the fruit or serve with milk or a dairy-free alternative instead of the yogurt.