Preheat oven to 200°C.
Place baguettes on an oven tray and bake for about 10 minutes, until hot and crispy on the outside.
Pat chicken dry and dice into bite sized pieces. Toss in a bowl with lemongrass paste.
Heat oil in a large frypan on medium-high heat. Add chicken and cook for 6-8 minutes, tossing occasionally, until golden and cooked through. Season to taste with salt and pepper.
Cut baguettes down the middle, leaving a hinge and spread with mayonnaise. Fill with slaw, lemongrass chicken and pickled onions.