Broccoli turns yellow and is non-toxic. It is edible.
The yellowing of broccoli bulbs is mainly due to the loss of magnesium ions contained in its chlorophyll after long storage. However, the taste and nutritional value of this kind of broccoli have not changed much, and it can be eaten normally, such as spinach and celery.
How to choose fresh broccoli
At first glance: there is no yellow flower on the dish, and then look at the bulb size of broccoli. The bigger the light bulb, the better.
The second touch: whether there are protrusions on the surface of the flower ball, the less protrusions, the better.
Three steps: weigh two flower balls of the same size by hand, and the lighter one is better.
Four pinch: pinch the stem with your fingers. If it is hard, it means that this broccoli is older.