Ok... so freezing it is a great idea.. but here are some other ideas once you decide to use it...

I use tons of this kinda meat..

besides hamburgers... you can do
I mix the meat with:
lemon pepper
mustard
1 egg
and consome (not sure term in english but will lookit up for you)
you can add Maggi sauce and/or Salsa Inglesa (similar to A1)

just about the same but in shape of a hotdog and you can put a slice of singles cheese inside.. yummy...

you can also try crumbing it up in small pieces and adding potatoes in cubes and have it as a stew something..

you can fry it in between corn tortilla (not chips)

or you can have in in tortilla chips on top of beans and sprinkle some cheese on top... you can spicy it up with lemon juice...

letme look at some spices names... so I can offer other stuff..