Do you love having toast with butter for breakfast? Beware, some kinds of butter contain vegetable oils like palm oil, making them margarine.
How to check: Put a piece of butter into boiling water. It will quickly melt and form a layer on the surface. Margarine will turn into pieces.
Another way to see if butter contains cream is to simply freeze it and then cut it with a knife. If the pieces are even and it cuts well, you have real buttery butter in front of you.
8. White rice
Thinking about a bowl of fried rice, but doubting its quality? Some rice brands replace the real thing with synthetic resin and potatoes: it looks natural but will not taste good.
How to check: Take a spoonful of rice, and set it on fire. Fake rice will smell of plastic and have black smoke.