Cook in a skillet over medium-high heat until crisp:
4 slices bacon
Drain on paper towels and crumble. If desired, reserve the bacon drippings. In a small bowl, combine well:
1/4 cup cider vinegar or vinegar of your choice
2 tablespoons olive oil, or vegetable oil, or bacon drippings
2 teaspoons yellow mustard seeds (optional)
2 teaspoons minced fresh parsley, or a combination of other fresh herbs
1 teaspoon grated onion
1 teaspoon sugar
Place in a salad bowl:
1 large bunch young spinach, trimmed, washed, and dried
Heat the dressing in a small saucepan over medium heat until just before it begins to boil and pour over the spinach greens. Sprinkle with the crumbled bacon and garnish with: