In a bowl whisk the egg yolk together with the lime juice, water and salt. Gently drizzle in the melted butter and continue to whisk.
Add the olive oil and continue to whisk. Now add the capers and anchovy and use an immersion blender to mix into the butter emulsion.
Spoon onto the cauliflower and sprinkle with paprika, salt and pepper and bake for 15 minutes until cooked and golden.
Serve on mash potatoesStir about 2 Tbls of the caper butter sauce through the mash to layer and intensify the flavours Place on bed of mash, drizzle more caper and anchovy butter over if you like and serve with a wedge of lime.