What you actually do
The classes worth taking begin at the Pazar or the fish market rather than in the kitchen. You walk the stalls with someone who buys there every week, learn what is local and what has been trucked in, and pick the fish yourself. Then you cook — usually a peka or a black risotto, something grilled, and a dessert — and sit down and eat it with wine. Reckon on four to five hours from market to coffee.
The market is the Pazar, against the palace's eastern wall — at its best before nine.
For the eating without the cooking, the Split food tour walks the same markets and replaces lunch.
What it costs
Around €100 at the lower end and up to €180 for the smaller, chef-led classes that include the market trip and decent wine. That is not cheap for a meal, and it is not really a meal: you are paying for four hours of somebody's attention and a technique you can use again. Most run twice a day Monday to Saturday, and most cap the group in single figures.
Why it is the good rainy-day option
Split has very few genuinely good wet-weather activities, and this is one of the few that is better in bad weather rather than merely tolerable in it. The market is covered enough to be workable, and the rest is indoors with wine.
More ideas for a wet day: things to do in Split when it rains.
Things to do in Split
Boat trips and tours
Split in one day