Blanch the butter and icing sugar, then add the rest of the ingredients and knead. Roll out the dough between two sheets of greaseproof paper and leave to chill. Cut into 4.2 x 4.2 cm squares and store in a sub-zero cold room. Bake at 170°C (338°F) for around 7 min.
Peel the peppers and dice them into a brunoise. Sweat the peppers in a pan with a little olive oil. Add the rice vinegar, water and sugar and leave to stew. Set aside.
Discolour the marmalade with the rice vinegar and water. Heat and add the gelatine (previously soaked in cold water).
Take the lemon peel and remove the pith. Blanch three times. Drain and cook in the lemon juice and sugar. Leave to chill.
Mix the cream cheese with half of the cream to soften it. Heat the other half of the cream and add the gelatine previously softened in cold water. Add the cream to the gelatine and cream cheese.
Prepare,scaleandgutthesardines. Fillet,bone,andleaveinthegrey salt for 1 hour. Soak for 30 min. Smoke for 10 min. Cool, then steam at 70°C (158°F) for 2 to 3 min.
Pour the cream cheese mix into the mould, chill. Pour in the red pepper jelly, chill. Turn out and place on top of the hazelnut shortbread. Fill the square hole with the compote. Bevel-cut little strips of sardine and place on top of the compote. Finish off the presentation with a small strip of piquillo pepper and some candied lime peel. Serve chilled, presented on a slate.