I'm not a fan of tuna, nor of the juice however it is an economical option if you're on a budget.
I suppose you could use the juice to make a salad dressing or even a marinade for Tuna steaks.
Just add oil if needed, a little lemon juice and your favorite herbs or seasonings, maybe even some capers too.
Good on you for trying to save it though...draining it does seem like a waste.

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