Nigella's recipes use large eggs - if egg sizes are not available how can I measure to make sure I use the right size? I am looking at a recipe that uses 3 eggs.
Nigella's recipe use UK large size eggs. If you can weigh the eggs (in their shells) then each egg will weigh between 65g and 73g (2 1/2 - 2 1/2 ounces). If you need to measure by volume then the egg (cracked but unbeaten) should be around 60ml (4 tablespoons/1/4 cup).
So for a recipe using 3 eggs if you weigh the eggs in their shells together you should have a weight between 195g (6 3/4 ounces) and 219g (7 1/2 ounces). By volume they should be around 180ml (3/4 cup).
In the US, Canada and Australia the egg sizing is different to the UK. For the US and Canada the equivalent egg size is extra large and for Australia the equivalent size is jumbo.