What do you call a fruit that is orange shaped, lime green colored, sweet/tart and yelloworange inside?

I found this weird citrus fruit in my yard and in looks like a cross between and lime and an orange. It taste seet and slightly tart, it is green and black (blemishes,) and has lemon shaped seeds. It is growing in area close to Florida in sandy soil and lots of sun. It also produces a lot of juice. What is it?