Whisk in the oil. Whisk in the yogurt. Whisk in the tomato juice. If this is too thick, gradually add more juice or vinegar. You ll see by the many recipes here that heaps of sugar aren t necessary for sweet, satisfying desserts.
Fruit juice can almost always replace a sugar syrup.
Here is a traditional recipe for Bananas Poached in Wine, followed by a modified one. Combine the white wine, sugar, vanilla, cinnamon, and raisins or currants in a saucepan, and bring to a simmer. Stir to dissolve the sugar, cover, and simmer 5 minutes. Peel and slice the bananas, and add to the poaching liquid. Cover and simmer 10 minutes.