Step by step

Put some pieces of crab in the rice

Tips
If you are not offended by potentially showing disrespect to Japanese gastronomy, and maybe you have children at home, you could make a bizarre fusion of o-nigiri and Italy’s own rice balls, adding a filling of meat or mozzarella and perhaps not frying your arancini/onigiri!
Trivia
O-nigiri have another name, perhaps less well-known here, which is ‘omusubi’. Their origins are ancient, so much so that it appears that they were already popular in Japanese gastronomy in the eleventh century. At the time they were called ‘tojiki’. Today in Japan there are delicatessens entirely devoted to their sale.