Start by blending tahini, olive oil, lime juice, honey, and salt in a food processor. Add cilantro and/or mint with water until smooth. Let it sit to thicken if needed before serving.
Heat oil in a skillet over medium-high heat. Press chilled brown rice into an even layer and cook undisturbed for 10-15 minutes until a golden crust forms. Carefully flip and keep warm.
Preheat the broiler and brush salmon with a glaze of honey, lime juice, sesame oil, and soy sauce. Broil about 10-15 minutes until caramelized and flaky on the edges.
Divide crispy rice into bowls, place the salmon on top, add cucumber slices, and drizzle generously with herbed tahini. Serve fresh for the best texture and flavor.