Preheat oven to 177 C or Gas Mark 4. Line a 9 x 13 inch baking pan with greaseproof paper.
In a food processor combine the oats, almond flour, sugar, baking powder, cinnamon, ginger and water. Pulse until oats are almost ground.
Press 1/3 of the dough into the bottom of the baking tray. Bake for 10 minutes until golden brown. Set aside.
In a medium bowl, combine the raspberries with the cherries, sugar, flour, Vanilla and Lemon Zest.
Spoon the jam over the crust and spread evenly. Add the raspberry mixture over the top. Sprinkle the remaining crumble on top. Return the tray to the oven and bake for 35 minutes or until golden brown.
Allow to cool and then cut into bars. These keep really well for a week in a sealed tub in the fridge.