i always bought the powdered stock or the one in cubes from the supermarket and never even thought about it as something that was possible to make from scratch, until i read this blog post from these light foot steps!
i really cant believe we did not think of that earlier. it is so easy and in no way time consuming. also it saves you money and you can use all the food scraps that would otherwise go to the compost or garbage. so you are using "waste" to create food! (if you have a compost, you can even use them twice by making stock AND composting them)
focus on foods like carrot peels and greens, stalks of herbs, celery, potato peels, mushrooms, zucchini, green beans, peppers, garlic or onion skins and avoid vegetables that can turn bitter like turnips, cabbage, and brussel sprouts.
we just started filling a 4l zip lock bag with all availible food scraps that seemed to fit. when it was full we put them in a large pot and covered them with water.
we added some salt, garlic and herbs (bay leaves, thyme, parsley) to it to give it a more specific flavour.
now bring it to a boil, let it simmer for about 45min and let it cool down before you strain out the vegetables. when it cooled down completely pour it into containers or zip lock bags and place them in the freezer. that's it!