In a large bowl, mix to gether the sesame seeds, pumpkin seeds, chia seeds, zaatar, psyillium husk and sea salt. Stir well together and add the water. Cover the bowl and set aside for 5 minutes, allowing the mix to considerably thicken a bit.
Preheat oven to 150 °C/ 302 °F with a rack in the center.
Line 2, 3 or 4 large oven sheets with parchment paper, (you may need more if you are using small individual oven sheets. Brush the parchment with olive oil (this will prevent the crackers from sticking to parchment after baking).
Spread the mixture using the back of a spoon and connect the whole surface of the sesame mix onto the oven sheet in an even paper thin layer, (it should be thin). Place in the oven and bake starting from 45 minutes to 1 hour until the sesame seeds turn to a golden color, the time depends on how large your oven sheet is, the smaller the less time it takes.
Remove from the oven, and while the paper thin sesame seed sheet is still warm remove the underneath parchment paper. Leave it to cool down completely then cover with cling film, and keep away from air draft, and they will keep crispy for 2 weeks, enjoy
Serve it with labneh, cheese and tons of dips.