Neginma-nabe: Tuna and Leek Hot Pot

Negima Nabe Tuna and Leek Hot PotSouth East Michigan got 6″-7″ of snow the other day, and now the night-time temperatures are 0*F (or insignificantly better), with high winds. Miserable climate! One of my cats is desperate to go outside, moaning and clawing the carpet to get my attention. This weather is also making me claustrophobic. What better time, then, to have some nabemono? This Japanese hot pot meal is easy to make, delicious, and hearty.