In addition to it, the most important thing when it comes to picky eaters or fussy kids is that the colours break the monotony and make even the boring sandwiches interesting if you make them to look like and call them the Tricolour Sandwiches. For instance if you layer your sandwich with something green such as the cucumber, something saffron/orange like the carrots and something white as the radish or may be the cheese, the sandwich becomes Tricolour!
Do not always keep it monotonous such as only the chapattis/rice/Pooris and a vegetable like the mashed potato. Here’s a quick list of certain colors of food that indicate an abundance of specific nutrients. You can include any of these to various meals in order to ensure your kid is “Eating the Rainbow”: