Lankavatara Sutra, Chapter 6, Section LXXXIV

As usual, I'm using the translation here.  And I'm still not any kind of teacher.

This bit is a nice distillation of what we mean by "discrimination":

Further, Mahāmati, of the five Dharmas—name, appearance, discrimination, right knowledge, and suchness— appearance is that which is seen as having such characteristics as form, shape, distinctive features, images, colours, etc. —this is "appearance." Out of this appearance ideas are formed such as a jar, etc., by which one can say, this is such and such, and no other; this is "name." When names are thus pronounced, appearances are determined¹ and there is "discrimination," saying this is mind and this is what belongs to it. That these names and appearances are after all unobtainable because when intellection is put away the aspect of mutuality [in which all things are determined] ceases to be perceived and imagined—this is called the "suchness" of things. And this suchness may be characterised as truth, reality, exact knowledge, limit, source, self-substance, the unattainable. This has been realised by myself and the Tathagatas, truthfully pointed out, recognised, made public, and widely shown. When, in agreement with this, [the truth] is rightly understood as neither negative nor affirmative, discrimination ceases to rise, and there is a state conformable to self-realisation by means of noble wisdom, which is not the course of controversy pertaining to the philosophers, Śrāvakas, and Pratyekabuddhas; this is "right knowledge."

¹ Samadharmeti vā that follows here is probably to be dropped on the strength of the Chinese versions.

Thus the object, the recipe,  and the suchness, it is all still unattainable.