In a large bowl, combine the flour, salt, yeast and sugar, mixing well.
Add the olive oil and warm water, then mix until fully combined. The dough will appear loose at first.
Leave to rest for 5–10 minutes. As the psyllium hydrates, the dough will thicken and become more structured.
Transfer to a lightly oiled loaf tin and smooth the surface with wet hands.
Cover loosely and leave to prove in a warm place for 45–60 minutes, until risen.
Preheat the oven to 220°C.
Bake for 35–40 minutes until golden and firm. For a crisper crust, remove from the tin for the final 5–10 minutes of baking.
Allow to cool completely before slicing.