Sunquat
A sunquat, also known as lemonquat or lemondrop, is a variety of citrus fruit, having an edible rind. It was initially created by Leslie Cude in Beeville, Texas, as a chance hybrid between a lemon (likely a 'Meyer') and a kumquat. The fruit is often sliced thin, having a somewhat tart flavor. References

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Lemons
Kumquats