In food processor, blend first 9 ingredients with ½ cup flax until combined.
Add in the onion, carrot, pepper, and salsa and continue to process until combined, but still little chunky. The mixture will be quite moist at this point.
Remove mixture to large bowl and stir in remaining 1 cup of ground flax until well combined. The liquid in the mix should absorb the flax and it will become more dough like.
Refrigerate for 1 hour
Once the dough is well cooled, it will be easier to handle. Shape into 8 patties, and either grill straight away, or freeze individually on a baking sheet, transferring to Ziploc bag or glass freezer container to store.