Make the jeow somPound garlic, chilies, and 1 tbsp sugar in a mortar until chunky. Add cilantro stems and pound lightly. Stir in lime juice, fish sauce, water, remaining 1 tbsp sugar, and optional MSG until dissolved. Fold in cilantro leaves. Let sit 10 minutes and taste.
3 SearWipe excess marinade off steaks, leaving a thin coating. Preheat a cast-iron skillet over medium-high heat about 4–5 minutes, or stainless steel about 2–3 minutes, until evenly hot. Add oil and let shimmer for 15–30 seconds. Sear steaks about 3 minutes per side, reducing heat if the sugary marinade scorches. For rare steak, remove at about 115°F; check with a thermometer because timing varies. Rest 5–10 minutes before slicing against the grain.
4 ServeServe sliced steak with jeow som, rice, and cucumbers. The dipping sauce also goes beautifully with grilled chicken.
Note
Marinate 20–30 minutes. USDA recommends cooking whole beef steaks to 145°F followed by at least a 3-minute rest. The 115°F pull temperature above is below that recommendation. Keep room-temperature marinating within 2 hours total (1 hour above 90°F).
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