How to make Tocino del Cielo

• Boil the sugar and water until the syrup forms a soft ball when dropped in cold water.
• Add the butter and let it melt.
• Beat the egg yolks, add the syrup after cooling it; add the lemon zest then blend well and strain.
• Line a pan or small mold with caramelized sugar, fill 3/4 full with mixture and steam until thick and set.
• Cool before unmolding. The tocino del cielo is often baked in small individual molds, then placed in small souffle cups before serving. Good for 10 persons.