Add the flours and salt into the mixing bowl and in the center pour the warm water and yeast.
Add the flax seed and nuts, then mix and knead for 10 minutes in the Thermomix® or 20 minutes by hand.
Transfer to a bowl and cover.
Set in a warm place to rise for 1 hour.
Transfer the dough onto a lightly floured surface and form into a ball-shaped loaf.
Place the dough onto a parchment paper lined pan and cover and let rise 1 hour longer.
Preheat the oven to 425 degrees F.
Dust the loaf lightly with flour and score.
Place into the oven along with a pan of water underneath and bake for 10 minutes.
Lower the heat to 375 degrees F, and bake for 30 to 40 minutes, until golden brown.