Put the potatoes in a pan of boiling
water, bring back to the boil and simmer
for 8-10 minutes until tender.
Meanwhile, mix the pesto and oil to
make a dressing. Halve the tomatoes,
drain and flake the tuna. Add the beans
to the potatoes for the last 3 minutes of
Drain the potatoes and beans and tip
into a salad bowl. Stir in the spinach so
that it wilts a little in the warmth from the
vegetables. Season with salt and pepper.
Scatter the tomatoes and tuna on top,
drizzle with the pesto and gently toss