Step 1 Preheat oven to 180°C. Place apples into a large bowl and toss with lemon juice, cinnamon, nutmeg, gluten-free flour mix and 1 tablespoon sugar. Pour apple mixture into a medium-sized, heavy-duty baking (or casserole) dish. Drizzle golden syrup over apples and set aside.
Step 2 To prepare topping, combine ground flaxseed, milk, oil and 1/2 cup sugar in a medium-sized mixing bowl. Mix until smooth.
Step 3 Sift in 2 cups gluten-free flour mix, salt, baking soda, baking powder and lemon zest. Mix to form a soft dough round.
Step 4 Place dough onto a flexible non-stick surface, such as baking paper or plastic wrap, and gently roll dough to a similar size and shape as the baking dish the apples are in (dough will be about 1cm-thick). Pick dough up by corners of plastic wrap, line up with baking dish, and invert on top of apples. Cut a few slits in dough.
Step 5 Bake for 30–35 minutes. Remove from oven and allow to cool for 15 minutes. Serve with yoghurt and cinnamon.