Combine the plant based milk, salt, maple syrup and yeast in a mixing bowl and set aside for around 10 minutes to activate the yeast. You know that it's active when the mixture starts to foam.
Stir together the ground flaxseed and water and set aside to soak for 10 minutes.
Add the flax egg to the yeast mixture, then add the buckwheat flour, rice flour, xanthan gum and chopped walnuts. Mix together really well until a sticky dough forms.
Transfer the dough into a loaf tin and set aside to rise, covered, for around 40 minutes. With around 10 minutes left, preheat the oven to 180 degrees C/350 degrees F.
Bake the bread in the preheated oven for 25-30 minutes. The crust should be golden brown and a toothpick should come out dry from the centre.
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