Raw egg white icing is a basic of Hungarian pastry: a white, glossy glaze that sets hard on cakes, gingerbread and biscuits. Use only pasteurised egg white, since it isn't cooked. Lemon juice whitens and stabilises it.
Sift the icing sugar through a fine sieve into a clean, grease-free bowl.
Add the egg white a spoonful at a time, stirring constantly. You need just enough to make a thick, spreadable, smooth paste.
Add the lemon juice, vanilla and a pinch of salt, then beat for 10-15 minutes (or 5 minutes with a mixer) until you have a glossy, smooth, cream-thick glaze.
If it is too thick, add a few drops of lemon juice or egg white; if too thin, add more icing sugar.
Brush the crumbs off the cooled cake and coat it evenly with the glaze using a spatula.
Let it dry at room temperature for 30-60 minutes. Do not put it in the oven, as it will crack and yellow.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.
Tips
Use pasteurised egg white.
Keep the bowl and tools grease-free.
Store airtight, covered with a damp cloth.
It can be coloured with food colouring or cocoa.
Frequently asked questions
Without egg?
A glaze of lemon juice, icing sugar and water is an alternative.