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Bring a pan of water to the boil, and heat half the butter with the olive oil in a frying pan. Toss the bread in the frying pan to coat in the butter and oil, then cook for 2-3 mins until the croutons are crisp and golden. Meanwhile, boil the beans for 2 mins. Add the peas and cook for 1 min more, then drain. Tip the croutons onto a plate.
Add the remaining butter to the pan with the garlic, sizzle for 30 secs until the garlic is golden, then add the veg and lemon zest, and cook for 1 min more. Toss in the croutons just before serving.