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We’re celebrating 5th O’Clock Happy Hour with a San Fernando Valley favorite.

Mister O’s is honoring the discovery of penicillin — the drink and the drug — with its own take on the famous cocktail, the Chain Riachton. It’s made with Benriach small-batch whiskey and other unique syrups.

The penicillin cure was actually discovered on Sept. 28. The drink will be on the menu through the middle of October.

Find the drinks at the bar and on the to-go menu at

This segment aired on KTLA 5 Live on Sept. 10, 2021.