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coat ramequins with ~1 tablespoon sugar
broil at low heat until the sugar is melted
add 6 egg yolk into a bowl and mix until broken
mix in 6 ounce sweetened condensed milk
mix in 7 ounce evaporated milk
mix in 1/8 teaspoon salt and ~1/2 teaspoon vanilla extract
strain mixture ~3 times
distribute evenly among ramequins
start steamer and let the water boil
lower the steamer heat until it's bubbling just slightly
steam ramequins for ~1 hour or when a toothpick stabbed in the middle comes out clean
let cool
refrigerate overnight
leche flan