Serious Eats: Talk

What is this little fruit?

For months I've been watering my citrus trees, and because of proximity, also my neighbor's. Part of his tree overhangs the fence, but since it's fruit, I'm not complaining. I just picked one of the little fruits. It has a thick yellow rind (like a lemon or sweet lime), almost no pulp, and is completely full of seeds. I licked it, and it's very bitter, with a hint of an orange flavor. Does anyone know what it is?

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