Bourbon with one big ice cube - only way to go.

Boulevardier Cocktail Recipe - Pinch and Swirl

Hand Carving Ice Cubes 🥃. a general guide for freezing water, by Alan B Smith

20 Best Bourbons for an Old Fashioned, According to Experts - Men's Journal

Old-Fashioned Recipe - NYT Cooking

Cocktail Ice: 3 Basic Types - The Cocktail Novice

Whiskey Review: First Call Kentucky Straight Bourbon – Thirty-One Whiskey

Neat, Straight Up, Or On The Rocks? How To Order A Spirit - SIP Awards

Don't Be Fooled — The Shape Of Ice Greatly Affects Cocktails

The 25 Best Bourbon Cocktails

Should I Drink Bourbon with Ice or – Colonel Bourbon Tshirts

The Best Old-Fashioned Drink (Recipe & Variations)