I highly recommend measuring the ingredients in grams using a kitchen scale. You can watch the video in the post for visual instructions.
Place the dried green peas in a strainer and rinse them thoroughly. Transfer them to a bowl, cover generously with water, and soak for at least 9 hours or overnight.
Drain the soaked peas thoroughly and rinse them once more. After soaking and draining, they should weigh approximately 400–415 g.
Preheat the oven to 350 °F (180 °C), using the conventional top and bottom heat setting. Line a baking sheet with parchment paper.
Blend the peas and the fresh water in a high-speed blender or food processor, scraping down the sides as needed.
Transfer the pea mixture to a large bowl. Add the psyllium husk powder and ground flaxseeds and stir until thoroughly combined.
Allow the mixture to rest briefly until it thickens noticeably and becomes easier to handle.
Add the salt, baking powder, and baking soda and mix until evenly incorporated.
Finally, stir in the vinegar. Knead the mixture briefly with your hands until a cohesive dough forms.
Transfer the dough to the prepared baking sheet and shape it into a loaf. Score the top several times with a sharp knife.
Bake for approximately 50–55 minutes. The exact baking time will depend on the thickness of the loaf.
Allow the bread to cool completely before slicing. It will continue to firm up as it cools.