The type of beverages aged in European, French, or American oak barrels can vary, and each type of oak imparts distinct flavours and characteristics to the final product. Here's a general overview of the types of beverages commonly aged in each type of oak:

### European (Serbian) Oak:

1. **Wine:**
- European (Serbian) Oak, especially French Oak, is widely used for aging wine. It contributes subtle, elegant flavours, such as vanilla, spice, and a touch of tannin. Bordeaux wines, Burgundies, and other fine wines often see aging in European Oak barrels.

2. **Cognac and Brandy:**
- European (Serbian) Oak, particularly French Oak, is favoured for aging Cognac and brandy. It imparts refined and complex flavours that complement the character of these spirits.

3. **Port Wine:**
- European (Serbian) Oak barrels are used for aging Port wine, adding structure and enhancing the wine's aging potential.

4. **Flavour Profile**

- European (Serbian) Oak varieties are generally known for imparting more subtle and complex flavors compared to American oaks. You can expect flavors such as vanilla, spice, and sometimes floral or fruity notes.

### French Oak:

1. **Wine:**
- French Oak is highly esteemed in the wine industry. It is commonly used for aging red and white wines, providing nuanced flavours that enhance the complexity of the final product. Chardonnays, Cabernet Sauvignons, and Merlots are often aged in French Oak.

2. **Cognac and Armagnac:**
- French Oak, particularly Limousin Oak, is preferred for aging Cognac and Armagnac. It imparts specific flavours that complement the characteristics of these brandies.

3. **Whisky:**
- Some Scotch whiskies are aged in French or European (Serbian) Oak barrels, particularly those seeking a unique and refined flavour profile.

### American Oak:

1. **Bourbon:**
- American Oak, specifically White Oak, is the primary wood used for aging bourbon. It imparts robust flavours, including vanilla, caramel, and oak spice, contributing to the signature profile of bourbon.

2. **Rye Whiskey:**
- American Oak barrels are commonly used for aging rye whiskey. The wood imparts bold flavours that complement the spicy and grainy nature of rye spirits.

3. **Tequila:**
- American Oak barrels are used for aging certain types of tequila, adding vanilla and caramel notes to the final product.

4. **Craft Spirits:**
- American Oak barrels are widely used in the aging of various craft spirits, including rum, brandy, and some experimental distillates. The wood's influence can be pronounced and versatile.

### Considerations:

- **Flexibility:** While these are general guidelines, there is a growing trend of experimentation, and some producers use different oak types for unconventional aging to achieve unique flavour profiles.

- **Blending:** Some producers may use a combination of oak types or utilise barrels that have previously held different types of beverages to create complex and layered flavors.

Ultimately, the choice of oak type depends on the desired flavour profile of the beverage and the traditions and preferences of the producer. The interplay between the characteristics of the beverage and the influence of the oak contributes to the rich diversity of aged spirits and wines available in the market.