Egyptian heat levels follow a specific hierarchy that locals understand but tourists discover painfully. Start with harissa (red, tomato-based, manageable) then work up to shatta baladi (green chilies, serious fire). Shatta sudaniya is the nuclear option that locals use to test each other's Cairo street cred.

Best testing ground: Any traditional grill place in Sayida Zeinab or around Al-Azhar. Ask for 'shatta harr' (hot sauce) and they'll bring a sampler platter. The green stuff is shatta baladi - made with fresh green chilies that hit different than anything outside Egypt.

Koshari Abu Tarek near Tahrir Square makes legendary house sauces. Their shatta baladi will make you sweat, but their shatta sudaniya (Sudanese-style with African bird's eye chilies) will end your day. They keep yogurt and bread ready because they know what they're serving.

Warning: This isn't tourist-friendly spice. Egyptian heat builds and lingers for hours. Keep plenty of mahlab (rice pudding) nearby for emergency cooling.