The combination of sesame in different forms – oil, tahini, black and white seeds – with citrus and the green avocado is a fresh, nutty and zesty way to set you up for the day and it looks gloriously pretty.
Whisk the tahini with the lemon juice until thoroughly combined, with no lumps left. Season well with salt and pepper and stir in the olive oil. Toast the sesame seeds in a dry frying pan for a few minutes until the white sesame seeds turn a pale caramel. Repeat with the buckwheat, if using.
Toast the bread and, if you like, rub gently with a clove of garlic. Mash up the avocado roughly on the two pieces of toast, season with a pinch of salt and drizzle with half the dressing. Sprinkle with the sesame seeds and chilli flakes. Serve with the rocket topped with the radish, the rest of the lemon-tahini dressing and buckwheat, if using, or more toasted sesame seeds.