Vegetable Salad with Tuna

Ingredients

• 1 1/2 cups (150 g) frozen peas
• 150 g frozen green beans
• salt
• 3 chilled cooked potatoes (waxy variety), unpeeled
• 1 yellow and 1 green bell pepper
• 1 medium white onion
• 2 large tomatoes
• 2/3 cup (100 g) green olives stuffed with pimiento
• 1 small clove garlic, finely chopped
• 4 tablespoons mayonnaise
• 1 tablespoon olive oil
• 2 tablespoons lemon juice
• freshly ground black pepper
• 1 can (180 g) water–packed tuna, drained
• lemon wedges, to serve