I honestly don't know what to say about the episode. It was a typical run of the mill episode with an interesting twist in the end. The Mentalist, as charming as the characters are, has never been a show with great mysteries or even suspense. In the rare instances an episode deviates from the formula, it can be exciting. Right now, it's held up by Jane.
A chef is found poisoned and Jane uncovers the mystery by accusing random people. The ending is expected. Jane is ten steps ahead of everyone else and sets a trap for the murderer by adding the pepper that had poison into the food. The murderer recognizes the pepper, and reacts.
The chef who was killed was an alcoholic, and during the case, they see the people who were hurt by the alcoholism. At the end of the episode, Lisbon sits down at her desk and is about to get a drink when she decides not to. This is the first time we've seen this, so it's probably because of Bosco's death.
Score: 8.6/10