You can prepare some homemade lunch boxes that don't need heating, but can bring rich nutrition, such as:

1. vegetarian rice ball lunch: mix rice and sushi vinegar, take a ball of rice, knead it into a round shape, add some carrots, corn and nuts, and finally wrap it with plastic wrap.

2. Potato and vegetable salad lunch: Dice the washed vegetables, blanch carrots and corn, add the cooked potatoes, add a teaspoon of chopped black pepper and a teaspoon of chopped basil, press the mud evenly with a spoon, and finally sprinkle with roasted sesame seeds, walnuts and Batam.

These lunches can prepare some fruits and drinks to make the lunch more rich and delicious.