Assemble and eat; avocado browns and toast softens within minutes. Boiled eggs keep a week in their shells, so doing those ahead turns this into a 4-minute breakfast.
It should yield to gentle pressure in your palm, not your fingertips, which bruise it. Flick off the small stem nub — green underneath means ripe, brown means overripe.
Ice water immediately, then crack all over and peel under running water. Older eggs peel far more easily than very fresh ones.
Oxidation. Lemon or lime juice slows it considerably, which is why it's in the recipe rather than just for flavour.