This is a top-notch version of the steakhouse classic. We make it with fresh spinach, which stays deep, bright green when cooked briefly in the microwave, and finish it with a crisp topping of toasted breadcrumbs or fried onions.
Place spinach and 2 tablespoons water in a microwave-safe large bowl. Cover tightly with plastic wrap; cut a small slit in the center with the tip of a paring knife to vent excess steam. Microwave on high (at 100 percent power), stirring halfway through, until the spinach is just wilted, 3 minutes in an 1,100-watt oven or 6 minutes in a 700-watt oven. (When removing the plastic wrap, be careful to avoid the hot steam.)
Scatter the onions, garlic, butter, 1/4 teaspoon salt and a couple grinds of black pepper in a microwave-safe 8-inch square baking dish. Cover tightly with plastic wrap; cut a small slit in the center. Microwave on high (at 100 percent power) until the onions are soft and translucent, 5 minutes in an 1,100-watt oven or 8 minutes in a 700-watt oven. If the onions are still a little hard, microwave again, covered, in 30-second increments, stirring after each.
Squeeze the wilted spinach completely dry, and place in the baking dish with the onion mixture. Add the heavy cream, cream cheese, Parmesan, cayenne, nutmeg, 1/4 teaspoon salt and a few grinds of black pepper, and stir to combine. Microwave, uncovered, on high (at 100 percent power) for 5 minutes in an 1,100-watt oven or 7 minutes in a 700-watt oven. The spinach should be hot and bubbly and the cream slightly thickened. Add the lemon juice, and stir. Top with breadcrumbs or fried onions and some lemon zest.
Copyright 2014 Television Food Network, G.P. All rights reserved.