Blend peas until smooth, push through a fine sieve, season with salt and add to potato leaves at room temp until serving.
Place lamb fat side down in to a cool pan and slowly render fat on a medium heat (roughly 10 minutes) once caramelised sear all other sides evenly and place in a 180℃ pre-heated oven for 17 minutes, remove and allow to rest for at least 15 minutes.
In a new pan add veg stock, half your butter and whisk on a medium heat until emulsified.
Once simmering add carrots, beetroot and turnip for 3 minutes then add peas and broad beans for a further 2 minutes, remove from pan and keep warm until ready to serve.
Wipe out pan, then on a medium heat add remaining butter with shallot & lemon and cook for 2 minutes until soft deglaze the pan with the wine and and reduce to a coating consistency.