You have to remove the intestines, as they apparently give the slugs a horrible, bitter taste. If you could eat them just like that, I'd never have to go to a supermarket again. But then again, ducks eat them, and you can eat the ducks.
As for slug solutions, it depends on how many are plaguing your premises. There is no way I could keep out the local Army of Darkness (as I call them) with egg shells, never mind the fact that my vegetable garden is 500 square feet. And beer traps just lure them in.
So, what I did, was build an electric fence with two stainless steel wires attached to 6 rechargeable batteries and a red LED as a resistor. The 6-7 Volts keep most of the slugs out, killing the small ones (sorry, little buddies!).
This month I have built a couple of cold frames. Last night it was -4 °C, but with a blanket over it, the temperature in the cold frame remained stable at 1.2 °C. Unfortunately, my wife forgot to open them yesterday, and half the plants died from the greenhouse effect (38 °C).
But all in all, it should help us plant things earlier.