We have a giant sour orange tree in our yard, which most people consider a great big waste of space. However when you consider that it's very similar in many ways to a lemon (and can easily replace them in most recipes), the tree starts looking a little more valuable. When you realize you can make a margarita out of those things, they become infinitely more valuable.
My basic recipe for the Southwest Sour Orange Margarita (only a little less good than the legit lime kind):
Two shots sour orange juice
One shot of good tequila
Half shot water
Big squirt of agave nectar
A few ice cubes.
Shake. I leave the ice cubes in. Drink. You can also add a splash of grenadine which I think is extra tasty, but at some point it stops becoming a margarita and turns into some weird Red Lobster "hurricane splash" type drink.
Earlier this year I made marmalade with some of the sour oranges. I always remember that making marmalade can be a frustrating process as getting it to set without adding pectin can be a pain, however I often forget that there is a soul-crushing amount of sugar in there. This year I left all of the oranges soaking in water for a day, that seemed to help as I got a good set. Recipes abound, I won't include the one I used because I'm still not 100% happy with it, maybe next year I'll add ginger, cardamom, vanilla or something else to give the taste more depth. Any recommendations?