Smoked Tofu Larb With Lemongrass

Name: Smoked Tofu Larb With Lemongrass
Ingredients: ⅓ cup (or more) fresh lime juice; ¼ cup light soy sauce; 1 Tbsp. palm or light brown sugar; 2 tsp. (or more) chile powder; 1 tsp. kosher salt, plus more; ¼ cup glutinous rice; 2 Tbsp. vegetable oil; 6 small shallots, thinly sliced; 3–4 lemongrass stalks, bottom third only, tough outer layers removed, finely chopped; 1½ lb. smoked or firm tofu, drained, cut into ¼” cubes; 2 Tbsp. black sesame seeds, plus more; 1¼ cups chopped mixed tender herbs (such as Thai basil and/or mint); Tender lettuce leaves (for serving)