Using these or those to refer to a previous sentence

Solution 1:

In this case, "these" vs "those" is based on whether the object is the subject of the discussion. Based on the context you provided, it looks like the topic at hand is grandma's apple pie (or this apple pie, as it could be written if it were made clear already it was grandma's apple pie being discussed), and that the coming sentences will discuss the pie/recipe and not the red apples, which are tangential to the pie.

Alternately, if the recipe was merely being mentioned, and we were to continue discussing the red apples, it could be written as "these apples" and "that pie".

Analogous to the distance, this case of these/those is based on relevance (or perceived distance from the topic at hand).

Solution 2:

In everyday speech the difference is largely indistinguishable. In British English, however, neither is frequently used, instead replacing your example of 'those' with 'such.'