Ever-so-slightly adapted from Near and Far
Place the cucumbers, onion, radishes, kale and tofu in a large mixing bowl.
In a small saucepan over medium heat, combine the lemongrass, vinegar, lemon juice, honey, and salt and simmer for a couple of minutes — long enough for the honey to dissolve fully. Remove from the heat and whisk in the red pepper flakes. Let cool for 5 minutes and pour over the cucumber mixture. Toss gently but thoroughly and let sit for at least 15 minutes. Toss again and adjust the salt and red pepper to taste.
If you’re serving this salad with soba noodles, cook them according to the instructions on the package. Drain off any residual liquid from the cucumber mixture into a small bowl. If serving with the noodles or with grains, toss them with this liquid. Top with pumpkin seeds and a good squeeze of lime. Serve the remaining lime wedges at the table.