The Artistry of Mixing Drinks by Frank Meier (1936, p.33)
| 0.5 glass | Bourbon whiskey — Bourbon Whiskey | base |
| 0.5 lemon | lemon juice — Lemon Juice | base |
| 1 teaspoon | maple syrup — Maple Syrup | sweetener |
- Shake well and serve.
Maple Leaf is a bourbon sour sweetened with maple syrup.
The Artistry of Mixing Drinks by Frank Meier (1936, p.33)
| 0.5 glass | Bourbon whiskey — Bourbon Whiskey | base |
| 0.5 lemon | lemon juice — Lemon Juice | base |
| 1 teaspoon | maple syrup — Maple Syrup | sweetener |