Preheat the oven to 200°C/180°C fan and line a 12x6x23cm loaf tin with baking parchment
In a large bowl, mix together the dry ingredients (flaxseed, sunflower seeds, chia seeds, psyllium husk flakes, and sea salt)
Add the olive oil and water to the dry ingredients and stir to combine until a sticky dough forms
Scrape the dough into the prepared loaf tin, pressing it into the edges, and smooth the surface with the back of a water-dipped spoon
Bake for 60 minutes until golden and firm to the touch
Remove the loaf from the tin and return to the oven for another 15 minutes
Place on a wire rack to cool completely before slicing and freezing
Toast before serving
