Summer Vegetable Gratin

My favorite food magazine right now is Cook's Illustrated.

When it comes to food they really mean business. They will work a recipe from every angle to streamline and perfect it.

So when I saw that they took on Summer Vegetable Gratin I was thrilled.

I remember my Aunt Kate making a wonderful Zucchini Tomato Bake in the summer, but when I attempted to recreate it's veggie glory I was a failure.

When Cook's Illustrated July & August 2008 issue arrived and had a veggie bake similar to Aunt Kate's I had to try it. It was so successful, I've already made it twice.

Summer Vegetable Gratin
Serves 6-8
Total Cost: $6.00 (aprox. $.75-$1/person)

6 Tbsp. olive oil
1 lb zucchini, ends trimmed and cut crosswise into 1/4 thick slices
1 lb summer squash, ends trimmed and cut crosswise into 1/4 thick slices
***2 lbs of only zucchini or only summer squash can be substituted***
2 tsp salt
3 large ripe tomatoes sliced 1/4 inch thick
2 yellow onions, cut in half and then thinly sliced from pole to pole
black pepper to taste
2 garlic cloves, minced or pressed through a garlic press
1 Tbsp fresh thyme leaves minced
***1 1/2 Tbsp dried thyme can be substituted***
3/4 cup bread crumbs
1 cup grated Parmesan cheese
1/4 minced shallots (about 2 medium)
1/4 cup chopped fresh basil leaves

Preheat oven to 400. Place the oven rack in the upper middle position. Brush a 9x13 pan with 1Tbsp of olive oil and set aside.

Combine sliced zucchini and squash with 1tsp salt in a large bowl and then transfer the salted veggies to a colander set over the bowl. Let stand for about 45 minutes, the veggies will release about 3 Tbsps of liquid.

Arrange tomato slices in a single layer over double layer paper towels and sprinkle evenly with 1/2 tsp salt and let stand for about 30 minutes. After that time, place a second double layer of paper towels over the tomatoes and press firmly to dry them.

Meanwhile, heat 1 Tbsp olive oil in a large non-stick skillet over medium heat until shimmering. Add onions, 1/2 tsp salt and black pepper to taste. Cook, stirring occasionally, until onions are soft and dark golden brown, about 20 minutes. Set onions aside.

Combine garlic, 3 Tbsp olive oil, black pepper to taste and thyme in a small bowl. In a large bowl, mix the zucchini and squash in half of the garlic oil mixture.

Pour zucchini and squash in the greased 9x13 pan. Arrange the caramelized onions in a single layer over the squash. Place the tomato slices slightly overlapping in a single layer over the onions. Spoon the remaining garlic oil mixture evenly over the tomatoes.

Bake 40 to 45 minutes, tomatoes will have started to brown around the edges and the vegetables are tender.

Mix breadcrumbs, 1 Tbsp oil, Parmesan and shallots in a bowl. Remove baking dish from the oven and increase heat to 450 degrees. Sprinkle breadcrumb mixture on top of tomatoes. Bake about 5 to 10 minutes more, the gratin will be bubbling and the cheese will be lightly browned.

Sprinkle with basil and let rest for about 10 minutes are room temperature before serving.

Red Pepper Variation: Replace 3 roasted red peppers, skinned and cut into 1 inch pieces for 1 lb of the squash (do not SALT the roasted peppers). The Parmesan cheese can be substituted with one cup shredded mozzarella.

photo from Cook's Illustrated