Let the fruit ripen at room temperature. As Guanabana ripens, the fruit with lighten in color and turn into a bright yellow-green color and the spines will soften. Ripe fruit should give gently to the touch and be somewhat fragrant.
Guanabana (aka Soursop)
Also known as soursop, Guanabana tastes like cherimoya and is fantastic in desserts. The fruit features a deliciously sweet-tart flavor, almost as if a creamy coconut-banana mixture was highlighted with notes of pineapple. Note that the skin and seeds are not edible.