Tocino del Cielo is similar with leche flan but these two desserts are made with very different ingredients. Leche flan is made with whole eggs, and milk and/or cream while tocino de cielo is made only with egg yolks, sugar and water. The combination of (lesser) ingredients leads to an extremely light and tender custard – much lighter than the traditional leche flan. Here's a simple recipe for Tocino del Cielo