Courgette, pea and broad bean tortilla

Ingredients

• 3 tbsp olive oil
• 350 g Jersey Royal or new potatoes, scrubbed and thickly sliced
• 1 small red onion, sliced
• 1 medium courgette (zucchini), trimmed and cubed
• 300 g fresh peas, podded (defrosted, if using frozen)
• 300 g broad beans, podded (defrosted, if using frozen)
• 5 large free range eggs
• 12 g mint leaves, chopped