Yotam Ottolenghi's Cauliflower Cake

INGREDIENTS

small cauliflower, outer leaves removed, broken into 1 1/4-inch florets (about 4 cups)

teaaspoons kosher salt, divided

medium red onion

5 tbsp

olive oil

1/2 tsp

finely chopped fresh rosemary leaves

Melted unsalted butter, for brushing

1 tbsp

white sesame seeds

1 tsp

nigella (also known as black caraway), cumin, or black sesame seeds

large eggs

1/2 cup

fresh basil leaves, coarsely chopped

1 1/2 cups

coarsely grated Parmesan or aged cheese

1 cup

all-purpose flour

1 1/2 tsp

baking powder

1/2 tsp

ground turmeric

Freshly ground black pepper