Pre-heat the oven to 180℃ / 350℉ (fan-forced).
In a small pot melt the butter and sweetener, mixing to combine. Add the bicarb and stir well.
I pulse the seeds in a food processor to break them up and make a finer slice (but you don’t have to). Mix the seeds, flour, oats (or quinoa), coconut and cinnamon in a bowl.
Add the butter/ sweetener mix and stir to combine.
Line a small tin (27cm x 18cm) with baking paper. Press ⅔ of the mixture into the base of the tin and press down firmly with wet hands and bake for 10 minutes. The remaining ⅓ will form the crumble top (so set aside until after the fruit is ready).
Whilst this is baking, put all the filling ingredients into the small pot (that you used in the first stage, no need to wash). I’ve used cherries and plums in this photograph as they are in season right now
Simmer until the fruit starts to soften, stirring occasionally.
Once the base is cooked, top with the fruit mixture and with wet hands, place with the rest of the crumble over the fruit.
Bake for approximately 20 minutes or until just golden brown.
Allow to cool in the pan, refrigerate until firm and then cut into slices (cooling it allows for it to be sliced without crumbling).