The following are nutritious meal recipes suitable for children aged 6- 12:

1. stewed potatoes with tomatoes and beef: beef and tomatoes are stewed slowly, and adding potatoes can provide carbohydrates and vitamins.

2. Pickled fish: Fish is rich in unsaturated fatty acids and protein, and pickled vegetables are rich in vitamins and lactic acid bacteria.

3. Fried rice with ribs and beans: ribs provide protein and calcium, beans are rich in plant protein and vitamins, and rice provides energy and nutrition.

Parents can adjust the menu as needed to meet their children's nutritional needs.