How to Make It
In a saucepan of boiling water, blanch the raisins for 2 minutes. Using a slotted spoon, transfer the raisins to a plate; let cool. Blanch the cauliflower florets until crisp-tender, about 2 minutes; transfer to the plate. Blanch the scallions for 1 minute; add to the cauliflower. Thickly slice the scallions crosswise.
In a large skillet, heat 1/3 cup of the olive oil with the coriander seeds. Add the onion, cover and cook over moderate heat until softened, about 4 minutes. Add the wine, bouquet garni and ground coriander; season with salt. Cover and cook for 5 minutes. Add the mushrooms and lemon juice, season with salt and pepper and simmer over moderately high heat, stirring, until the mushrooms are just tender, about 5 minutes.
Transfer the mushrooms to a bowl. Add the tomatoes, tomato paste and raisins to the skillet and simmer until the sauce is thickened, about 8 minutes; discard the bouquet garni and coriander seeds. Add the mushrooms to the sauce and bring to a boil, then season with salt and pepper. Let cool.
Pat the cauliflower and scallions dry and put in a bowl. Add the remaining 2 tablespoons of olive oil, season with salt and pepper and toss. Mound the mushrooms on plates and top with the cauliflower and scallions. Garnish with the mint and chives and serve.