Place the 3 egg yolks and a teaspoon of water in a double boiler with simmering water below. (Or use a glass bowl over a small saucepan.) Whisk the yolks until thick, about 5 minutes. Off the heat, whisk in the lemon juice. Add the butter, two tablespoons at the time, until melted and thick. Add a pinch of salt and the sriracha sauce; whisk to combine.