Heat oven to 210deg. Line tray with paper. Mix flour and salt into a large bowl. Rub butter into flour until it resembles fine breadcrumbs. Add milk. Use a round bladed knife in a cutting motion to mix until evenly incorporated and mixture begins to hold.
Turn dough onto a lightly floured surface and gently knead until smooth.
Use a lightly floured rolling pin to roll out into a 30 x 40cm rectangle.
Spread pizza sauce, leaving a 2cm boarder around the edge.
Sprinkle with cheese, ham and pineapple. Starting from a long side, roll up firmly to form a log. Brush the edge with the extra milk and press down to firmly seal. Cut crossways into 12 equal portions about 3cm thick.
Place on prepared tray and bake for 25-30 mins until golden brown.