Step 1

Remove the stems from the spinach and wash, drain and pat dry thoroughly. Place into a large mixing bowl and set aside.

Step 2

Place the eggs into an electric kettle and cover with cold water by at least 1-inch. Turn the kettle on. Once the water comes to a boil, the kettle will turn itself off. Leave the eggs in the water for 15 minutes. Remove and peel off the shell. Slice each egg into 8 pieces and set aside.

Step 3

While the eggs are cooking, fry the bacon and remove to a paper towel to drain, reserving 3 tablespoons of the rendered fat. Crumble the bacon and set aside.

Step 4

Transfer the fat to a small saucepan set over low heat and whisk in the red wine vinegar, sugar and Dijon mustard. Season with a small pinch each of kosher salt and black pepper.

Step 5

Add the mushrooms and the sliced onion to the spinach and toss. Add the dressing and bacon and toss to combine. Divide the spinach between 4 plates or bowls and evenly divide the egg among them. Season with pepper, as desired. Serve immediately.