2Combine Thai chilis, garlic, salt, sugar, fish sauce, lime juice, toasted rice powder, and chopped cilantro in a mortar and pestle to make the dressing.
3Adjust consistency of the dressing with cold water if needed.
4Slice the cooked steak and place in a bowl with cucumber, red onion, tomato, mint, and cilantro.
5Pour the prepared dressing over the salad and toss.