Pork souvlaki with flatbread

Name: Pork souvlaki with flatbread
Ingredients: 2 tablespoon olive oil; 2 tablespoon white vinegar; 2 clove garlic, crushed; 1/2 cup lightly packed fresh mint leaves, chopped; 2 teaspoon finely grated lemon rind; freshly ground black pepper; 800 gram pork scotch fillet, cut into 2cm cubes; 1 cup (280g) greek-style yoghurt; 1 1/2 tablespoon lemon juice; 1/4 cup (60ml) olive oil; 1/2 iceberg lettuce, shredded, for serving; 4 cup (600g) plain flour; 1 teaspoon salt; 100 gram butter, chopped; 1 1/2 cup (375ml) milk