Feta cakes with Greek salad

Name: Feta cakes with Greek salad
Ingredients: a drop of rapeseed oil, for the baking sheet; 700g potatoes, peeled and cut into chunks; 1 lemon, zested, half juiced; 6 spring onions, very finely chopped; 2 tbsp chopped mint; 3 tbsp chopped parsley; 100g feta, crumbled; 1 large egg; 6 tbsp wholemeal flour; ½ tsp smoked paprika; 320g tomatoes, cut into wedges; 1 cucumber (about 320g), diced; 1 red onion finely chopped; 12 Kalamata olives, quartered; 1-2 tbsp finely chopped mint; 2 tsp lemon juice; 2 tsp extra virgin olive oil