Talk to me about Flaxseed

[MilkNoSugarPlease]

What is it? Where do I buy it?

I want to make this

Is flax seed necessary?!

TIA

Flax Seed is Linseed by another name.

They sell it in holland and barrett/Julian Graves/ health food shops

This is just used as a vegan egg replacement because it is gloopy like beaten egg. If you aren't vegan an egg can be used instead.