Can you tell me if it broke at the inside lever? If the lever broke and the cable is still attached under the hood, then you should be able to grab the small metal ball at the end of the cable with a pliers or a vise grips and while someone else pushes down on the hood, you should pull the cable inside. This should work.
If the ball on the end of the cable has broken, try to cut away some of the plastic cable cover until you can find some of the metal cable to grab with the vise grips.
If it is broken under the hood, you should be able to pull the grille out enough to find the cable and release it from it's retainer and then pull the cable to release the latch.
If none of this works, you will need to unbolt the latch that holds the hood down.
Hopefully the handle broke inside and you can use the vise grips trick with an assistant.
Note: Make sure you lube the latch with white lithium grease to prevent this from happening again. A binding latch puts more stress on the cable.
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