Smoked mackerel and celeriac remoulade

I've been dreading making this since I bought the new book, at one point considering starting in November in order to put this one off for as long as possible but last night I bit the bullet and made this for today's lunch.  I'm not a fan of celeriac or radishes and long time blog readers will know I'm relatively new to mustard and don't like it if it's a dominant taste and so as I put this together last night my heart was sinking.  As I was about to eat this just now my mate at work reminded me to keep my faith in Nigel - good advice. I've no idea why I would have doubted him - it was a really amazing combination of flavours that just work.  It's days like this that remind me how good it is to be led by someone else and not just stick to what you know. Once again, thank you Nigel!