Separating with a utensil is generally prohibited, unless it is done in the specific cases outlined which are considered derech achila, the normal way of eating.

We discuss the cases where one would be permitted to remove a secondary item from the mixture.

There are five different types of items that are considered secondary and are therefore forbidden to be removed from a mixture.

We discuss the circumstances where one may not remove the undesirable, as well as the permitted way to do so.

There are three aspects of weekday Borer, which is forbidden, the opposite of which are called the 'normal way of eating,' and is permitted.

We discuss cases which are not mixtures, and therefore do not involve an issue of Borer. We also discuss a case where there are layers upon layers, and removing the upper layers to get to the lower layers will not constitute Borer.

In order for one to be involved in separating, we must define what is considered a mixture.

We begin to define the concept of Borer, separating, when it is forbidden and when it is permitted.

We introduce the concept of Borer, separating, which has many common applications that need great clarity.

Winnowing is the first of three melachos that involve separating the desirable part of the food from the undesirable parts. Winnowing is done through the aid of the wind.