Congrats on the new fridge Lilly! 

I don't think that fruit is a trifoliate orange as they are described as inedible.  Mike might be right in calling it a wild lemon or maybe it's some kind of a hybrid of a wild lemon.  Only way to tell is to peel it and several others, place in the blender with about 6 oz of Patron, add a little sugar, orange marmalade, ice, water and triple sec.  Blend it and taste it several times.

Lilly, stay away from those mushrooms will ya?