1.Preheat oven to 200°C. Oil a shallow 22cm square cake pan.
2.Sift flour, soda and salt into a medium bowl; rub in butter. Add enough buttermilk to mix to a soft, sticky dough. Turn dough onto floured surface; knead lightly until smooth. Roll dough into a 30cm x 40cm rectangle.
3.Spread dough with combined sauces; sprinkle with onion, capsicum, pepperoni, pineapple, olives and half the cheese. Roll dough tightly from long side. Using serrated knife, trim ends. Cut roll into 9 slices; place scrolls, cut-side up, in pan. Sprinkle with remaining cheese. Bake about 25 minutes.
We drained our pineapple and then patted it dry on paper towels to prevent the pineapple making the scrolls soggy. These scrolls are delicious eaten warm or cold. For a meat-free version, replace the pepperoni with thinly sliced swiss brown mushrooms.