1.
To make the crackers, mix the flour, semolina and salt with the sesame, sunflower and pumpkin seeds in a bowl. Pour the water into a jug and whisk in the maple syrup and oil. Stir into the flour mixture and then using your hands mix to a dough, then knead for 5 minutes. Return to the bowl, cover and set aside for 20 minutes.
2.
Preheat the oven to 180C/350F. Line two baking sheets with parchment paper. Oil the work surface and roll the dough out to a 3mm thickness. Using a ruler and a sharp knife cut into 24 x 15x5cm rectangles. Place on the prepared baking sheets close together but not touching. Spray the crackers lightly with water and bake for 15-18 minutes until crisp and lightly golden. Turn off the oven, open the door for 30 seconds and close again. Leave the crackers in the oven for another 10 minutes for extra crispness.