This dish? Pure comfort. I started tinkering with it during a rainy winter in Bristol when I needed something that simply worked and felt kind. It is brimming with flavors that tell a little story, like the quiet sweetness of leeks whispering to the earthy cauliflower, and that brilliant, crunchy cauliflower au gratin with breadcrumbs topping that makes people sit up and notice.
I love it because it is the very definition of kind comfort food: familiar, generous, and honest. Picture slicing into it and watching steam rise, carrying thyme and a faint dusting of nutmeg. If you are wondering what to do with leeks lingering in your fridge, this is your answer. It shows them soft, sweet, and utterly willing to soak up the sauce.
Preheat the oven to 400 °F and lightly brush a 1-quart baking dish with olive oil.
In a skillet, heat 1 tablespoon olive oil and add 2 sliced leeks and 1 teaspoon thyme leaves. Cook, stirring occasionally, for 15 minutes.
In the meantime, to a large pot of lightly salted boiling water, add the cauliflower florets and boil for 2 minutes.
Drain the cauliflower well. Mix the cauliflower florets with the sautéed leeks. Season with a pinch of grated nutmeg, and salt and black pepper to taste. Transfer the mixture to the prepared baking dish.
Heat ⅓ cup olive oil in the pan and stir in ⅓ cup flour. Cook, stirring constantly, for 1 minute.
Gradually whisk in 1 ⅔ cups unsweetened plant-based milk. Stir in ¼ cup crumbled cheese until melted. Remove from the heat. Taste and adjust for seasoning if needed.
Toss 1 ounce fresh breadcrumbs with 1 tablespoon olive oil. Set aside.
Pour the béchamel sauce over the vegetables in the baking dish. Sprinkle the breadcrumbs over the gratin. Scatter ⅛ cup flaked almonds over the top.
Bake the gratin for 25-30 minutes or until the top is golden.
Allow to cool for 5 minutes, then serve warm.
For this baked cauliflower and leeks dish, start by gathering a few essentials from your kitchen. A decent skillet to soften the leeks is worth it, cast iron if you have it because it holds heat without drama. You will also want a large pot for blanching the cauliflower, one that will take boiling water without sulking.
A baking dish of about one quart will cradle everything in the oven. Glass or ceramic both work and let you watch the edges bubble. A sharp knife for slicing leeks and florets is an absolute must, along with a cutting board that does not slide around. I have an old wooden board with knife scars that I will not give up; it feels right under my hands.
For the sauce, a whisk or wooden spoon keeps the roux smooth and lump free. Measuring cups and spoons help here, especially for the flour and oil. A colander to drain the cauliflower and a grater for fresh nutmeg are useful too. Tossing breadcrumbs in a small bowl with oil before they go on top helps them crisp in the oven.
Let me share some small secrets I use when making how to make a vegan bechamel sauce: take your time with the roux. Heat the oil, stir in the flour and let it bubble gently, then slowly whisk in the plant milk. Rushing invites lumps. I usually reach for oat or almond milk for a gentle creaminess that does not fight the vegetables.
The leeks deserve a calm sauté. Slice them thin and wash them properly so there is no grit left to surprise you. Cook them with thyme until they are soft and almost melting. For the cauliflower, a quick two minute blanch in salted water gives you tender but still textured florets. Drain very well. Too much water will make the sauce thin and sad.
Nutmeg is the small magic here. A pinch warms without shouting. And do not skip the topping: toss breadcrumbs with a tablespoon of olive oil and scatter flaked almonds for crunch. If your oven runs hot, tent with foil halfway through to stop the top from overbrowning. Let the bake rest for five minutes after it comes out of the oven so the slices hold together and the sauce settles. Worth the wait.
It behaves like a winter vegetable bake should: comforting, a bit indulgent, but light enough to leave you glad you ate it.
Swap the cauliflower for broccoli florets or do half and half to bring a vibrant green and more goodness to your beautiful plant based casserole. Broccoli softens a little faster so keep an eye on blanching. Stir in a handful of spinach at the end if you want extra green energy.
Add sliced mushrooms to the leek sauté for a deep, woodsy note that gives the whole dish more soul. Pat them dry first so they brown rather than steam. Scatter extra almonds on top for texture. The result feels richer and very satisfying.
Dice carrots or parsnips and sauté briefly with the leeks before mixing with cauliflower for natural sweetness and color. Add a pinch of chili flakes or smoked paprika for heat that wakes the dish up. This makes the bake more filling and a little more exciting on cold nights. Tone down the spice if you are feeding children.
This gratin shines as a main. Serve it with a crisp green salad dressed simply to cut through the richness. Quinoa or brown rice on the side soaks up any remaining sauce and stretches the meal if you need it to. A sprinkle of fresh parsley or chives lifts the final plate.
For drinks, a light white wine suits it well, or a herbal infusion if you want no alcohol. Leftovers reheat nicely and make for satisfying lunches the next day.
Yes. Assemble up to the baking step, cover and refrigerate for a day. Bring it to room temperature a little before baking and add a few minutes to the oven time if it is cold. The flavors meld overnight and that usually makes the dish taste deeper.
Start simple: heat the oil, stir in the flour to make a paste, then whisk in the plant milk slowly over low heat. Add the crumbled vegan cheese at the end and stir until it melts into the sauce. Taste and adjust salt, pepper and a whisper of nutmeg.
Yes. Portion into containers after cooling and keep in the fridge for up to three days. Reheat in the oven at 350 degrees for best texture. If it seems dry, add a splash of plant milk while warming to bring the sauce back to life.
Easy. Add diced potatoes or extra root vegetables, sauté them first so they soften, then bake. You may need a few extra minutes in the oven, but the bechamel binds everything into a satisfying meal.
No problem. Use nutritional yeast for a cheesy tang and boost herbs and nutmeg. A squeeze of lemon at the end brightens everything and keeps the dish lively.
This Vegan Cauliflower, Leek and Cheese Gratin is a comforting dish that can be prepared in about 40 minutes, adding a heady note to any weeknight dinner. Did you make this recipe? Share your creations by tagging @cookmerecipes on Instagram with the hashtag #cookmerecipes
Dairy-Free Recipes
Low Cholesterol Recipes
Vegan Recipes
Vegetarian Recipes
