For the lamb trim the lamb and score. Blitz the rosemary with the garlic and oil and poor the marinade over the lamb.
For the sweet breads and porridge, blanch the sweet breads in boiling seasoned water for 20 seconds and refresh in ice water, peel and trim off the membrane and fat. Leave on a tray lined with cloth.
Blanch the nettle leaves in salted boiling water and quickly plunge into ice water, drain and squeeze the excess water out and blitz till a smooth puree.
Rough chop an onion and place in a hot pan and colour slightly and pour in the chicken stock and reduce by half and pour in the cream reduce again. Blitz and then add half to the egg yolks while whisking and add back to the rest and blitz with on high. Adjust the seasoning and transfer to a squeeze bottle.
Prep vegetables and blanch in boiling water and refresh in ice water.
To serve season the lamb on the fat side and place in a hot pan and render the fat down slowly on a medium low heat, seal the other sides and place in the oven at 180 degrees for 9 minutes. Remove from the oven and leave to rest.
Meanwhile sweat shallots and garlic in a pan add porridge oats and then chicken stock and cook over a moderate heat stirring occasionally. Finish with parmesan, butter, and the nettle puree then adjust the seasoning. Season the sweetbreads and place in a hot pan with a little oil, colour turn over and add a knob of butter and then leave to rest. Heat through the jus.
Place the veg in boiling water and place a knob of butter in a pan till starts to foam add butter and some water to create an emulsion, glaze the veg, season and drain on a tray lined with a towel.
To plate spoon the porridge into the serving pot and arrange the sweetbreads on top with some of the wild garlic shoots and wood sorrel. Carve the lamb into two rectangles and place. And place three blobs of onion custard and then the vegetables finish with the wild garlic shoots, flowers and wood sorrel and some of the lamb jus.