I have a cheap 1500w portable induction cooktop I used for this exact purpose. On the lowest setting, it only pulls ~300W AC, so you can run it on the smallest of generators or portable power stations without any problems.

I have a 12,500W generator as well that could easily run my main induction range, but I reserved loading on this for making sure the furnace blower was moving. Didn't want to play games with fuel supply at the time.