I've made it loads of times without a fail.
Standard 5 egg whites & 5oz caster sugar. Nothing else.
I've just put it in the oven 10 minutes ago at 140' and it's got a brown tinge already.
I've turned the oven down to 120' and will leave it much longer.
Daren't open the door for a full inspection.
Please advise, I've no time to make another.