What small spicy chili is often added to pho?

What small spicy chili is often added to pho? Bird's eye chili is a common spicy addition to pho, especially when diners want extra heat.

Bird's eye chilies are small, narrow peppers known for their intense pungency. They may be sliced into rings and served alongside lime, Thai basil, bean sprouts, and other fresh garnishes so each person can adjust the bowl to taste.

The pepper is much hotter than a typical jalapeño and is widely used across Southeast Asian cuisines. In Vietnam, fresh chili peppers may vary by region and restaurant, so “bird's eye chili” describes a common type rather than a mandatory ingredient in every bowl.

A common mix-up is confusing the chili garnish with the red hot sauce often placed on the table. Fresh bird's eye chili adds sharp, direct heat, while bottled sauce contributes vinegar, garlic, sweetness, and a smoother chili flavor.