Preheat oven to 100 degrees Celcius. Line a large baking sheet with baking paper.
Put chia, flax and water in a large bowl. Stir and leave for 15 minutes.
Combine pepita, sunflower seeds, sesame seeds, salt & dried rosemary to flax mixture and stir well.
Spread the mixture evenly on the lined baking sheet and bake at 100 degrees C for 90min.
Turn cracker over and continue to bake for 90min. Turn the heat off and let it cool inside the oven.
Break the cracker into rough pieces once it has completely cooled.