Cheesy Make-Ahead Zucchini Tian with Parmesan Rice
Salt pulls the natural juices out of the shredded vegetables so the rice can soak them up in this Zucchini Tian (Naturally Healthy).

You need two pounds (1 kg) of fresh zucchini to make Cheesy Make-Ahead Zucchini Tian with Parmesan Rice. The salt draws out natural juices that act as the stock for the grains. The whole pan bakes at 425°F (220°C) until the rice swells and absorbs every drop of liquid.
Zucchini Prep
You shred the zucchini and toss the pieces with two teaspoons of salt. You set the salted shreds in a colander over a separate bowl. The salt needs twenty minutes to sweat the liquid out of the vegetables. This liquid functions as the stock for the pan. You press down on the shreds to force the maximum amount of juice into the bowl below. You can pour the squeezed liquid back through the colander to strain out any loose vegetable bits. You then wash the salty shreds under cold tap water for fifteen seconds. You wring out the lingering water forcefully and discard this salty runoff. Finally, you pat the washed vegetables until they feel mostly dry. A cook who skips the salt and just sautés the zucchini will lose the juices needed to flavor the dish.
Gratin Base
The cooking liquid mixes the extracted zucchini juice with enough milk to reach exactly two and a half cups. You need to warm this dairy mixture gently on the stove or in the microwave. A full boil causes the milk to split.
You warm two tablespoons of olive oil in a skillet and drop in the minced garlic and diced onion. You cook the aromatics slowly over medium heat for eight minutes. The onions become sweet and caramelized as they turn translucent and take on a golden color. High heat prevents the onions from softening properly.
You increase the burner to medium-high heat and fold in the dried zucchini. You cook the mixture for five minutes while tossing everything often. You scatter two tablespoons of flour over the vegetables and cook for exactly two minutes. You must keep the mixture moving the whole time to toast the flour evenly. You take the pan off the heat and fold in all but two tablespoons of the Parmesan cheese. You taste the vegetable base and add salt and black pepper if desired. The half cup of uncooked medium-grain white rice swells significantly due to the high volume of liquid. You can use medium-grain white rice, or a long- or short-grain variety. Brown, arborio, paella, basmati, and jasmine rice do not work for this recipe. You stir the rice and your warmed liquid into the vegetables.
Vegan substitutions
You can easily adapt the pan for a vegan diet. You omit the parmesan cheese and swap in a plant-based milk. Soy milk works better than almond milk because it lacks a nutty flavor. You can top the final pan with panko breadcrumbs and a drizzle of olive oil before it goes into the oven.
Assembly & Baking
You need a buttered baking dish with a six to eight cup capacity. You can prepare the meal in advance by stopping after you mix the rice and liquid into the skillet. You keep the unbaked pan in the refrigerator and bake it on the day you plan to eat.
To bake right away, you set the skillet back onto the burner until it reaches a simmer. You pour everything into the baking dish and scatter the remaining two tablespoons of Parmesan cheese across the top. A final tablespoon of olive oil goes over the cheese. You cover the pan tightly with a lid or foil and place it into the top third of the oven.
You bake the covered dish for fifteen minutes before taking off the lid. The dish bakes uncovered for another ten to fifteen minutes. You pull the pan when the top looks golden and the moisture appears soaked in. You must then angle the pan slightly to check for hidden pools of moisture. You need to return the dish to the oven in five-minute bursts if liquid pools on the surface. The pan will turn out soggy if you skip this check.
Resting and serving
A ten-minute rest on the counter allows the rice to absorb any remaining liquid. You serve the warm dish immediately after this short resting period.
- You can serve the pan as either a main course or a side dish.
- The baked dish keeps its shape much like a gratin when portioned.
Cheesy Make-Ahead Zucchini Tian with Parmesan Rice
Ingredients
- 2 lb zucchini
- 1 cup finely diced brown onion, about 1 onion
- 2 garlic cloves, minced
- 2.5 cup warm liquid, zucchini juices topped up with milk
- 0.5 cup uncooked medium-grain white rice
- 2 tbsp flour
- 3 tbsp olive oil, divided
- 0.67 cup grated Parmesan cheese, divided
- 2 tsp salt
- Black pepper to taste
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Method
Zucchini Prep
Gratin Base
Assembly & Baking
Substitutions
You can swap the medium-grain white rice for a long-grain or short-grain white rice, but avoid brown, basmati, jasmine, arborio, and paella rice for this recipe.
To make a vegan version, omit the Parmesan, use soy milk instead of almond milk to avoid a nutty flavor, and finish the top with panko breadcrumbs drizzled in olive oil.
Storage
You can build this in advance by stopping after the rice and liquid are stirred in, refrigerating the unbaked mixture until you are ready to simmer and bake it.
Serving
The baked Cheesy Make-Ahead Zucchini Tian with Parmesan Rice keeps its shape much like a gratin when portioned, making it an excellent main course or side dish.
Common mistakes
Do not discard the liquid drawn out of the salted zucchini, as those extracted juices function as the flavorful stock for the entire dish.
Warm the combined zucchini juice and milk gently, because bringing the mixture to a full boil will cause the dairy to split.
Avoid rushing the onions over high heat, since cooking them slowly over medium heat allows them to become sweet and properly caramelized.
Techniques
Choose a baking dish with a six to eight cup capacity to ensure the zucchini and rice mixture fits properly.
Always angle the pan to check for hidden pools of moisture at the end of the baking time, returning it to the oven if needed to avoid a soggy texture.
Allowing a hot baked casserole to rest on the counter before slicing helps the interior starches set up so the portions hold together neatly.
Cooking raw flour in the skillet with your vegetables and fats for a couple of minutes before adding any liquids will successfully remove its raw and pasty flavor.
- Store
- You can build this in advance by stopping after the rice and liquid are stirred in, refrigerating the unbaked mixture until you are ready to simmer and bake it.
Why do I need to rinse the shredded vegetables during the Zucchini Prep?
Rinsing the salted zucchini under cold water for fifteen seconds removes the residual salt. You must forcefully wring out and discard this second round of liquid so the final dish is not overly salty.
Can I use brown rice instead of white rice for this bake?
Brown rice is not suitable for this recipe, and you should also avoid arborio, paella, basmati, and jasmine varieties. If you need a substitute, you can safely swap the medium-grain white rice for a long-grain or short-grain variety.
How do I cook the Cheesy Make-Ahead Zucchini Tian with Parmesan Rice if I prepared it in advance?
If you stopped your Gratin Base prep after adding the rice and stored the unbaked mixture in the refrigerator, you need to bring the skillet back to a simmer on the stove. Once it simmers, pour everything into your buttered baking dish and proceed with the standard Assembly & Baking steps.
What happens if I accidentally boil the milk and zucchini juices?
Bringing the combined zucchini juice and milk to a full boil will cause the dairy to split. Always warm this liquid mixture gently on the stove or in the microwave to keep the sauce smooth.
Why does the recipe recommend soy milk for a vegan variation?
Soy milk is preferable to almond milk as a dairy alternative because it lacks a nutty flavor. Using a neutral plant-based milk ensures the savory notes of the vegetables remain the main focus.
Why do recipes often ask you to cover a casserole with foil while baking?
Covering a baking dish tightly traps steam, which helps raw starches cook evenly and prevents the top from burning prematurely. Removing the cover for the final stretch of baking allows excess moisture to evaporate so a golden crust can form.
Do I really need to let baked casseroles and tians rest before eating?
Allowing a hot baked casserole to rest on the counter before slicing helps the interior starches set up. This short resting period gives the food time to absorb remaining moisture so the portions hold together neatly on the plate.
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