Step 1

Place the spinach in a large bowl and leave at room temperature. Bring a medium pot of water to a boil over medium-high heat. Use a slotted spoon to gently lower the eggs into the water. Boil until both the whites and yolks are set (hard-boiled), about 10 minutes. Transfer to a small bowl filled with ice water and cool completely. Once cool, peel the eggs and cut each into quarters.

Step 2

Meanwhile, put the bacon in a large skillet and set over medium heat. Cook, stirring occasionally, until golden brown and crisp, 6 to 8 minutes. Transfer the bacon with a slotted spoon to a paper towel-lined plate to drain. Remove half of the bacon fat to a small bowl and reserve.

Step 3

Return the skillet and remaining bacon fat to medium heat. Add the mushrooms, garlic, 1/4 teaspoon of salt and a few grinds of black pepper to the same skillet. Cook, stirring occasionally, until tender, 3 to 4 minutes. Pour in the reserved bacon fat, vinegar, mustard and honey and whisk until smooth and emulsified. Taste and season with more salt and pepper.

Step 4

Pour the hot bacon dressing over the spinach and toss until evenly coated and slightly wilted. Transfer to a platter and top with the eggs, red onion and reserved bacon.