Caramelized Onion, Spinach and Gruyere Strata with Sauteed Cherry Tomatoes

INGREDIENTS

6 cups

cubed day-old French bread

2 tbsp

unsalted butter, plus more for the baking dish

1 tbsp

canola oil

large Spanish onions, halved and thinly sliced

1 tsp

sugar

Kosher salt and freshly ground pepper

box frozen chopped spinach, thawed and squeezed dry

large eggs

3 cups

whole milk

1 cup

heavy cream

2 cups

grated aged Gruyere cheese (about 8 ounces)

2 tsp

dijon mustard

1 tbsp

finely chopped fresh thyme

1/8 tsp

freshly grated nutmeg

For the tomatoes:

3 tbsp

canola oil

2 pints

cherry tomatoes

3 tbsp

chopped fresh chives