Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown
600 gm very fresh tuna joint (yellowfin is good) trimmed of sinewy or possibly bloody bits 2 tbsp extra virgin olive oil sea salt and black pepper
3 lrg shallots finely minced
1 x fat clv garlic
1 x thumb of flaky sea salt (try Maldon available from larger supermarkets)
2 tsp finely minced rosemary needles
6 Tbsp. mayonnaise lemon juice to sharpen