A Buttery, crumbly ube-infused shortbread crust that's richly earthy, subtly sweet, and dyed that gorgeous natural purple hue—soft yet sturdy, with a melt-in-your-mouth texture that hints at ube's nutty warmth. Then comes the star: a silky-smooth, sunshine-yellow calamansi layer that's bright, floral, and perfectly tart-sweet, bursting with the fresh, aromatic zing of Philippine limes.