Steam the sweet potatoes until soft enough to mash (15 mins)
Fry the onion in a frying pan with a dash of oil until soft.
Base
Place the almonds, oats, walnuts, arrowroot powder, ground flax and dried herbs into a food processor and blitz until you have a grain like consistency.
Transfer the ingredients to a bowl, add the oil and water and combine until you reach a sticky, crumb consistency.
Transfer the mixture to a 23 inch flan tin and press down evenly using the back of a spoon until you create the flan base.
Filling Cont...
Transfer the steamed sweet potatoes to a bowl, and mash until smooth. Stir in the onions, beans, spinach and all the herbs and seasoning.
Spoon the mixture onto tart base, smooth over using the back of a spoon.
Press the tomato halves over the top of the filling.
Bake in the oven at 180 degrees C for 30 minutes until cooked through.
Serve warm with salad or keep in the fridge for 2-3 days in a suitable container.