What is the best fat-to-vinegar ratio for hot bacon dressing?
A reliable starting point is about 3 tablespoons bacon fat to 1/4 cup vinegar. That gives you tang with enough richness to round it out. If it tastes too sharp, add a pinch more sugar. If it tastes too heavy, add an extra tablespoon of vinegar.
How hot should the dressing be to wilt spinach?
Warm and steamy is the goal. It should be hot enough that you see a little steam when you whisk it, but not violently boiling. If it is boiling hard, it can over-wilt the greens fast and make them watery.
Do I have to use spinach?
Nope. It is also great on leaf lettuce, romaine (slice it thin), frisée, or a spinach and spring mix blend. Tender greens wilt more evenly than thick, crunchy ones.
Can I make it without sugar?
You can reduce it, but a touch of sweetness helps balance the vinegar. If you prefer, swap the sugar for honey or maple syrup. Start small and taste as you go.
Why did my dressing turn cloudy or thick?
That is usually the flour thickener doing its job. If it gets thicker than you like, whisk in 1 to 2 teaspoons water or a splash more vinegar while warming.
Can I make it without flour?
Yes. The flour makes a lightly spoon-coating dressing. For a thinner, more vinaigrette-like version, skip the flour and just whisk hard while it is warm.