Zucchini and Yellow Squash Au Gratin

Zucchini and Yellow Squash Au Gratin is a delicious and elegant take on the classic French dish, Gratin. Originating from France, the term ‘au gratin’ refers to a culinary technique that involves topping a dish with a browned crust, often using breadcrumbs, cheese, or a combination of both. This particular version leverages the natural sweetness and flavors of abundant summer squash varieties—zucchini and yellow squash. It’s a terrific way to introduce more vegetables into your diet without compromising on taste. Perfect as a comforting side or a stand-alone vegetarian dish, this gratin is sure to impress at any meal.

The Origins and Appeal of Gratin

The culinary tradition of gratin dates back to France, where it is revered for its versatility and flavor. Traditionally, gratins are prepared with a variety of ingredients, but they all share the characteristic of a golden, crispy top. This dish is typically served as a side but can be easily transformed into a main course with the right combination of ingredients.

Health Benefits of Zucchini and Yellow Squash

Zucchini and yellow squash are nutritional powerhouses. They are low in calories but high in essential vitamins and minerals such as Vitamin C, Vitamin A, and potassium. These vegetables are also rich in antioxidants and dietary fiber, making them an excellent choice for a healthy diet. By incorporating them into a gratin, you not only enhance their natural flavors but also boost your meal’s nutritional value.

Ingredients for Zucchini and Yellow Squash Au Gratin

To prepare this scrumptious dish, you will need the following ingredients:

Step-by-Step Directions

Preparation and Layering

1. Preheat your oven to 375°F (190°C). Lightly grease a baking dish with butter to prevent sticking and enhance flavor.
2. Arrange half of the sliced zucchinis and yellow squashes in an even layer in the baking dish. This base layer ensures even cooking.
3. Sprinkle half of the sliced onions and minced garlic over the vegetables. These aromatics add depth of flavor to the dish.
4. Season with salt, pepper, and a bit of thyme. These spices bring out the best in the vegetables.
5. Repeat the layers with the remaining zucchinis, yellow squashes, onions, and garlic. Season again with salt, pepper, and thyme to maintain consistency of flavor.

Creating the Creamy Base

6. In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. This will form the creamy base of the gratin.
7. Pour the hot cream evenly over the layered vegetables. This ensures that each layer absorbs the rich creaminess.

Adding the Cheesy Crust

8. Sprinkle half of the Parmesan and Gruyere cheeses over the top of the vegetables. These cheeses provide a rich and tangy flavor.
9. In a small bowl, mix together the breadcrumbs and the remaining cheeses. This mixture will create the desired golden, crispy crust.
10. Spread the breadcrumb mixture evenly over the top. This ensures a uniform crust that will brown beautifully.
11. Dot the top with butter, cut into small pieces. This adds richness and helps in browning.

Baking to Perfection

12. Cover the dish with aluminum foil and bake in the preheated oven for 20 minutes. This initial baking softens the vegetables.
13. Remove the foil and continue baking for another 15-20 minutes, or until the top is golden brown and the vegetables are tender. This final baking period is crucial for achieving the perfect texture.
14. Allow the gratin to rest for a few minutes before serving. This helps in setting the layers and makes it easier to serve.