The night before, combine the buckwheat, pumpkin seeds, sesame seeds and lemon juice into a mixing bowl. Cover with cold water and cover the bowl with plastic wrap and leave to soak in the refrigerator overnight.
The next day, rinse and drain the soaked mixture. Pour into a mixing bowl
Add the rest of the ingredients to the seeds and combine well.
Preheat the oven to 150C and line a baking tray with baking powder
Spread the mixture evenly over the tray and toast in the oven for 40 minutes, until the granola looks dry and crunchy, turning the tray halfway to ensure even cooking.
Remove from oven, let cool and then break up the granola in pieces.
You can store it in an airtight container for up to a week.