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Grate the rind of 1 orange and press the juice.
Peel the bananas and cut them in half lengthwise.
Place in a dish.
Mix the sugar with the orange rind and juice, the Grand Marnier and the raisins.
Pour over the bananas and allow to marinate for 1 hour. Butter 3 rectangles of foil and place a banana on each. Divide the juice and the raisins between them.
Securely seal each parcel and place them on the grid of the bowl equipped with a clip-on handle.
Steam for 15 mins. Serve in the parcels.