Remove as many of the leaves as possible.
Blanch the leaves in plenty of boiling, salted water, then allow to cool.
Cut out semicircles along the edges of the leaves.
Place a strip of butcher paper on the work surface.
Lay out the green cabbage leaves in three colour shades from dark at the bottom to light at the top, with the outer edge on the butcher paper, so they overlap by half a centimetre in the middle.
Chop the rest of the cabbage into a very fine brunoise.
Sauté the garlic and onion and add the chopped cabbage.
Add the stock and Culinaire Original and reduce the mixture.
Cut the cooked sweetbreads into equal cubes and add.
Place the filling on the leaves and fold them over.