Special equipment: a 1 1/2-inch-tall by 3- to 3 1/2-inch-wide round mold
For the yuzu dijonnaise: Whisk together the mayonnaise, Dijon and yuzu juice and refrigerate until needed.
For the green mustard: Whisk together the Dijon, chives, cilantro, parsley, shiso and tarragon and refrigerate until needed.
For the tartare: Combine the meat, apples, capers, tobanjan, chives, shallots,2 tablespoons of the yuzu dijonnaise and a pinch of salt in a mixing bowl and mix well.
Brush 1 teaspoon of the green mustard onto the bottom of a medium serving plate.
Stand 1 1/2-inch-tall by 3- to 3 1/2-inch-wide round mold in the center of the plate and stuff it with the tartare mixture, pressing down to firm.
Remove the mold and top with a poached quail egg.
Sprinkle with some of the chopped pine nuts.
Repeat with the remaining ingredients on 3 more plates.
For the truffled goat butter toast: Slice and toast the bread.
Spread with the goat butter and drizzle with the truffle oil.