Gently rinse the fox nuts under cold water to remove any dust or debris, then drain and pat dry thoroughly with a clean towel.
In a mixing bowl, toss the dried fox nuts with a teaspoon of neutral oil, ensuring they are evenly coated. This helps them crisp up uniformly during roasting.
Sprinkle a pinch of sea salt over the coated nuts, then add any optional spices like smoked paprika or cayenne pepper for a smoky or spicy kick. Toss again to distribute the spices evenly.
Spread the seasoned fox nuts in a single layer on the prepared baking sheet, making sure they’re not piled up, which helps them roast evenly and get crispy all over.
Place the baking sheet in the preheated oven at 180°C (350°F). Roast for 12 to 15 minutes, shaking the pan gently every 5 minutes to promote even browning and prevent burning.
As they roast, listen for a crackling sound and smell a smoky, nutty aroma. The fox nuts should turn a golden-brown color with a slightly glossy surface.
Remove the tray from the oven and let the fox nuts rest for about 5 minutes; they will crisp up further as they cool, developing that satisfying crunch.
Once cooled slightly, squeeze fresh lemon juice over the roasted fox nuts for a bright, citrusy zing that complements their smoky flavor. Toss gently to coat.
Transfer the roasted fox nuts to a bowl and serve immediately while still crispy and aromatic. Enjoy this simple, flavorful snack on its own or as part of a larger spread.