Boil the hard-boiled egg, or a batch of them, and peel them. Refrigerate in an airtight container for up to 5 days.
Cook the bacon in the microwave or in a pan, let it cool off for a few minutes, and coarsely chop it into pieces. You can also use a tablespoon of bacon bits.
Assemble:
Make a bed of lettuce in the bottom of a lunch container. Top it with the chopped egg, tomatoes, and bacon pieces. Drizzle with dressing if eating the salad immediately. If not, hold off the dressing.
Pack it for Lunch:
Fill a small lidded container with the salad dressing. Refrigerate the dressing and the salad until it’s time to leave and pack it inside a lunch bag with an ice pack. Drizzle the dressing right before lunch.