For the pesto basil, wash, shake dry, pluck leaves from the stems. Peel the garlic. Put the basil, nuts, garlic and oil into a narrow mixing cup and chop finely with a hand blender. Season to taste with salt and pepper
Clean, wash and cut the spring onion into long thin strips. Wash, clean and slice the tomatoes. Spread slices of bread with pesto, cover with tomatoes and sprinkle with strips of spring onion