1. Chicken: Chicken is an easy food to prepare and cook. It can be easily heated in the microwave oven, fried, roasted or cooked.

2. Salad: If you want a healthy lunch, salad is a good choice, which can include all kinds of vegetables, fruits and protein, such as chicken breast, turkey or ham.

3. Sandwich: Sandwich is a combination food, which can include all kinds of meat, vegetables and fish. Sandwiches can be prepared before the start of the working day and brought to the office at lunch.

4. Boiled egg/egg: This is a simple and easy-to-prepare food, which can be put in a cooked dish or soup or baked in an oven.

5. Seafood: Seafood is a kind of nutritious food, which can include fish, shrimp, crab and shellfish. You can easily heat it in the microwave oven, or steam or bake it.

6. Vegetable salad: Mix all kinds of vegetables together, such as lettuce, cucumber, tomato and carrot, to make a delicious and healthy salad.

The above are some choices, you can choose one of them according to your own preferences. Remember to consider nutrition and sustainability when preparing food, while avoiding excessive consumption of oils and processed foods.