Mix the batter : In a bowl, whisk together tapioca flour, plain flour, water, salt, and chopped spring onions until smooth and runny.
Cook the pancake : Heat oil in a non-stick pan over medium heat. Pour in half the batter and swirl or spread it into a thin circle. Let it cook undisturbed until the edges lift and the bottom is set.
Flip and finish : Gently flip the pancake and cook the other side for another 30–60 seconds until set. Remove from the pan.
Add the egg : In the same pan, add a bit more oil if needed. Pour in one beaten egg,then immediately place a cooked pancake on top. Let it cook for 30 seconds so the egg adheres.
Assemble and roll : Flip the pancake so the egg side is facing up. Add ham and cheese to the centre, then roll it up. Lightly sear the outside for extra texture and to help melt the cheese.
Repeat with the remaining batter and make another pancake with ham and cheese filling.
Serve : Slice into bite-sized pieces and drizzle with sweet chili garlic sauce—or any sauce you like!