When we first used to make stir fry or Chinese sweet & sour stir fry in Malawi, we would use specific vegetables (cabbage, french beans, carrots etc.) and make the sauce at home. We would have it either with plain rice or fried rice. Then when we came here we saw the supermarkets with pre made sauces like hoi sin, teriyaki, black bean etc. As always we had to be cautious as these tended to contain some form of fish oil or sauce. The other thing with all the ready made sauces is that they have added preservatives to give them the long shelf life. So after trying a few brands which where vegetarian, we created our own version by using shop bought sauces and our own home made mix. However I do try and make the sauces at home to taste, this way I know what I am putting into it and each time the taste is different. The list of ingredients started to change also. After marriage I started adding tofu, mushrooms, and savoy cabbage to my stir fries. By making my own sauce at home I sometimes get the correct balance of vegetables and sauces and sometimes I get it wrong, however that is all part of the fun of cooking.