Combine all marinade ingredients in a bowl. Add the beef. Massage to coat. Cover. Refrigerate at least 4 hours, ideally overnight.
Make ssamjang: combine doenjang, gochujang, sesame oil, honey and garlic. Stir until smooth.
Set up a grill plate, electric griddle, or hot heavy pan in the centre of the table.
Cook the marinated beef in batches over high heat — 90 seconds per side. Don't crowd.
Eat: take a lettuce leaf, add a spoonful of rice, a piece of beef, a smear of ssamjang, a pinch of kimchi or pickled radish. Wrap and eat in one bite.
Repeat with the next batch. Keep banchan, rice and lettuce topped up.