Add the flaxseed (only) to bowl with the water.

Let it sit for 15 minutes.

After this time the flaxseed will become gloopy, which is exactly what we want.

In the same bowl add the rest of the seeds and the salt. Mix well.

Prepare a large baking tray (or 2 smaller ones, like I did) with some baking paper on it and pour the seed mix.

Spread the seed mix with a spoon, try to make a very thin layer.

Bake for 15 mins at 200 then turn off the oven, leave door half open and keep in it inside the oven for further 5 minutes. Timings might change slightly based on the thickness of seed layer.