Which are are the most cheap but healthy meals you can cook for a family?
Make home made soups with lentils, split peas, lots of veg. Very cheap, highly nutritious. You could also make homemade pizzas. The dough is easy to make, get the kids involved. Make a tomato sauce beforehand adding carrots, onions, celery and garlic whizzing it all together. This way picky people don’t know what they are eating and you are getting good mins and vits into them. However, it sounds to me as though you have made a rod for your back by letting them not eat what you have prepared. Let little tummies go to bed hungry if they won’t eat their dinner. Don’t worry, they won’t die of starvation. Claim the kitchen back! You are the mother.
