It'll probably work as intended, but there are so many things wrong. How's it spin, with wires for the 12 volt source? Since you Have 12 volts, why not use one of those coffee mugs you plug into the car cigarette lighter and a spoon. What sort of waterproofing would you use for the board. Soup would conduct pretty good, not to mention the lead and flux probably not to healthy, but all that sheep fat might no be either. If you spin it using the capacitor as a handle, wouldn't that mean putting your fingers in the soup? Hope the last guy washed his hands after making the yellow snow.
Sorry, don't think it's a great idea in practice, but it'll probably function. Should include some sort of thermal protection, the transistors might not last long after the soup is consumed, but then again the ambient temperature might be good enough.