What's the best way to respond to this sacrifice?

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Eo____

I've never played this opening myself but the times I played against opponents who used this opening or similar openings where more than one pawns are sacrificed I ended up losing the game :(.

 

PrawnEatsPrawn

You could just beat them to the punch, the Blackmar-Diemer Gambit:

 

 

I do pretty well with it, regardless of the general feeling that it's not completely sound.