Most home bars have vodka, gin, and whiskey covered. But liqueurs? That's where cocktails go from decent to unforgettable.

Here are the 5 I'd start with:

1. Cointreau (Orange Liqueur)

The backbone of Margaritas, Sidecars, and Cosmopolitans. Nothing replaces a quality triple sec.

2. Campari

Bitter, bold, and irreplaceable. You need it for a Negroni, an Americano, or a Boulevardier.

3. Amaretto

Almond-forward, sweet, and incredibly versatile. Amaretto Sour is the crowd-pleaser, but try it in a Godfather with Scotch.

4. Chartreuse (Green)

130 herbs, made by monks, tastes like nothing else. Essential for a Last Word.

5. St-Germain (Elderflower)

The bartender's ketchup — it makes everything taste better. Add it to gin & tonics or any citrus cocktail for instant elegance.

Start with these five and you can make 30+ classic cocktails. That's a real bar.

I break down every major liqueur category inside Mixology Insider — profiles, recipes, techniques, the whole thing.