What is a kumquat
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A small kind of sour orange,I think...
Sweet-tart citrus, looks like a miniature orange, entirely edible (including skin).
Diana B is a trusted home cook.
Image here: http://www.takesavillage.net/2012/02/14/custom-kumquat-salsa-make-it-yours/ They're about 1-2 long, lots of seeds, but make fabulous marmalade, etc.
Kumquats are tiny citrus fruits, just about an inch long. The rind is quite sweet, the fruit inside is eye-poppingly sour -- so eat them whole to get a sweet-sour taste explosion! (I love kumquats, can you tell?)