Whole Roasted Cauliflower with Almond-Herb Sauce

Instructions

1. Heat the oven while you prepare the cauliflower: Place a heavy oven-proof skillet (a cast-iron skillet looks very nice) or a baking sheet in the oven and turn the heat to 375 degrees. Place a small pan of hot water on the floor of the oven, to create steam.
2. Break off and discard the outer leaves from the cauliflower. Cut off the bottom of the stem, and then use the tip of a small, sharp knife to cut off the leaves close to the stem. Carefully cut out the hard core of the cauliflower, near the bottom. Leave the main stem intact and make sure not to cut through any of the florets.
3. Rinse the cauliflower (leave the water clinging to the outside) and place on a work surface, core side up. Drizzle with olive oil and use your hands to rub over the cauliflower until evenly coated. Sprinkle with salt.
4. Place the cauliflower on the hot pan in the oven, core side down, and cook until very tender all the way through when pierced with a knife, at least 1 hour or up to 2 hours. During the cooking, baste 2 or 3 times with more olive oil. It should brown nicely. If you have a convection feature, use it toward the end of baking to brown the crust.
5. Make the sauce: In a small frying pan, toast nuts over low heat, shaking often, just until golden and fragrant. Set aside to cool.
6. In a food processor, combine almonds, garlic and butter and pulse until smooth. Mix in oil, then vinegar. Mix in herbs and red pepper flakes, if using. Season to taste with salt and pepper. Set aside.
7. When cauliflower is tender, remove from the oven. (If desired, run it briefly under the broiler first to brown the surface; there is no need to do this if you used convection.)
8. Serve cauliflower in the skillet or from a serving plate. Cut into wedges and spoon sauce around each wedge.