Heat the olive oil in a wok or large frying pan over a medium heat.
Add the shallot and chopped grilled pepper and cook for 2–3 minutes until softened.
Stir in the shredded tempeh and cook for a further 3 minutes, stirring regularly.
Add the soy sauce and sesame oil, then stir in the cooked buckwheat.
Cook for another minute or two until everything is heated through.
Cut the avocado into bite-sized pieces.
Place the avocado and rocket in a large bowl and drizzle with the lemon juice.
Add the warm buckwheat and tempeh mixture and toss gently to combine.
Taste and season with salt and pepper if needed.
Serve warm or at room temperature.