Cut the avocado in half, remove the pit, and strip off the skin. Cut the flesh into slices. Transfer to a plate, drizzle with the lime juice and set aside.
Wash and dry the spinach leaves. Put them in a mixing bowl.
Cut the large cherry tomatoes in half and add all the tomatoes to the mixing bowl, with the scallions. Cut the cucumber into chunks and add to the bowl with sliced radishes.
Make the dressing. Put the tofu, milk, mustard, wine vinegar and cayenne in a food processor or blender. Add salt and pepper to taste. Process for 30 seconds, until smooth. Scrape the dressing into a bowl and add a little extra milk if you like a thinner dressing. Sprinkle with a little extra cayenne and garnish with radish roses and herb sprigs.