Spread out the bread cubes on a baking tray. Toast in the oven at 180°C / 350°F for around 10-12 minutes until light golden brown.
Stir together the ground flaxseed and water in a small bowl. Allow the seeds to swell for a few minutes to make the flax 'egg'.
In the meantime, heat the olive oil in a frying pan, then add the diced onion, diced celery and sliced vegan sausages, then cook them for about 10 minutes until sauteed and starting to brown. I like to fry the sausage slices on one side so they can be in direct contact with the pan and get brown well.
In a large oven dish combine the toasted breadcrumbs with the contents of the frying pan, the flax egg, and all other ingredients. Mix through.
Bake at 180°C / 350°F for 30-40 minutes until the top is crisp and browned to your liking.
Notes
Vegan sausages
We used 1 pack of Linda McCartney Red Onion and Rosemary vegan sausages. 1 pack of vegan sausages typically weighs around 300g or 10oz.Some sausages have a casing which you may prefer to remove.For variations and extra tips, see the post above.