Slice the tomato jelly into 2-mm- / .08-in-thick pieces. This should always be done to order; if it is done too far ahead the jelly will dry out. Place a rectangle of tomato jelly on the plate.
Place about 2g / .07oz of marmalade next to the tomato jelly in a tall and tight mound.
Sprinkle a pinch of black olive powder on the opposite side of the onion marmalade, directly on top of the tomato jelly.
Pry a small piece (about 3g / .11oz) off of the goat cheese; this will give it a crumbled look. Place next to the black olive powder, leaning on the tomato jelly.
Sprinkle a pinch of pepper on top of the goat cheese.
Using an eyedropper, pour a few drops of olive oil on the plate.
Scoop a small quenelle (20g / .71oz) of the sorbet on top of the tomato jelly and serve immediately.