What kind of squash is Kalabasa?

Online Answer
Kalabasa is the Philippine word for squash and is sometimes used interchangeably to refer to both summer and winter squash (Cucurbita maxima, Cucurbita pepo, Cucurbita moschata). The Philippine Bureau of Plant Industry refers to kalabasa as "Cucurbita moschata Duch," which includes several varieties of winter squash.
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All you need to do is thinly cut off the last part of the stem or blossom end of the cucumber and with that piece rub the end of the cucumber in a circular motion. While you do this, a white foam-like substance will emerge from the inside of the cucumber. This is the cucuritacin, which causes bitterness in it.
Wild cucumbers contain relatively large concentrations of cucurbitacin and are highly bitter, he said, "while their domestic cousins we grow in the garden and buy in the store, tend to have less but varying amounts of the bitter compound.