1. In a separate bowl, combine the ground chia seeds with 1/4 cup of water and let the mixture sit for 5 minutes to thicken.
2. In the meantime, rinse the canned white beans thoroughly in a sieve, then drain them and pat dry with a paper towel. Make sure they aren't wet.
3. Process the oats and the walnuts in a food processor or blender (use the pulse function, as they should still have some texture and not turn into fine flour).
4. Add all the remaining ingredients to the food processor and pulse again. Don't over-process the mixture, or it will be mushy. The mixture shouldn't be sticky, but if it is, simply add some flour.
5. Freeze the mixture for about 10 minutes. This will make it easier to shape into sausages.
6. Form sausages with your hands (use 1/3 cup of the mixture per sausage). Place the sausages on a large plate lined with parchment paper and transfer the plate to the fridge for about 20 minutes.
7. Wrap each sausage in some parchment paper and tin foil and twist the ends, like a candy wrapper. Then, place them in a steamer basket or pot and steam for around 35 minutes.
8. Once cooked, you can serve immediately, pan-fry, or even grill for a crispy result.
9. To pan fry, preheat a large skillet over medium heat. Brush the sausages with a little oil on each side and add them to the pan. Fry for around 7-10 minutes, turning occasionally until browned and heated through.
10. Enjoy with mustard, BBQ sauce, or serve in a burger bun like a hot dog.