**Truffle oil is an inexpensive way to get a similar aroma.** Most commercial versions use added flavoring, so expect a simpler, sometimes stronger flavor than fresh truffle shavings. [North American Truffle Growers Association](https://trufflegrowers.com/about-truffles/faux-fungi-the-problem-with-truffle-oil/)

For your burger, try mixing **a drop or two into a tablespoon of mayonnaise**, taste, and add more gradually. Spread it on the bun after cooking; a little can go a long way.

Other options:

- **Truffle butter:** Melt a small pat over the finished burger. Check the ingredients—products vary in their truffle content and added flavoring.
- **Sautéed mushrooms:** Cremini or shiitake browned in butter provide earthy, savory depth, though they won’t reproduce truffles’ distinctive aroma.

It’s also worth asking the restaurant whether they used truffle oil or truffle mayo alongside the shavings. That could help you identify the flavor you enjoyed and recreate it cheaply.