Making your own meal is a minimalist practice because it is cheaper. You also help in minimizing waste by not carrying disposable food containers like you would if you take home overpriced food from a restaurant. Packing your own lunch will also save you from traveling to a restaurant and waiting for your food.
The easiest way to begin implementing this practice is to begin by cooking breakfast. It’s the easiest meal to make for yourself, and it’s a simple way to introduce the habit. After a month, you will have saved plenty of money you otherwise would’ve spent on overpriced breakfast meals.