If you're given cheese or a non vegan sauce on a meal you ordered

Rainbow
And they make you a new one but tell you you can keep the messed up one because they will just throw it away, what do you do? Do you throw out the sandwich with cheese? Eat it so it isn't wasted? I'm asking in cases where there isn't someone with you who wants to eat it. 
The only thing that bothers me more than seeing people eat animal products, is throwing out half the meat or cheese they ordered because they didn't finish it. But today my order was messed up at Panera and I didn't know what to do so I kept the sandwich and tried to feed it to my dog lol. He wouldn't eat it though so now it's in the trash and I feel guilty for wasting it. 

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