Try this Poppyseed Dressing recipe, or contribute your own.
A simple list of pantry staples hides the vigorous chemical reaction required to make a stable poppyseed dressing. Vinegar provides the necessary acetic acid, while dry mustard acts as a natural emulsifier, bridging the gap between oil and water phases. Without mustard powder, oil and vinegar separate almost instantly upon resting. Grated onion contributes both sharp sulfur compounds and microscopic solids that help anchor the suspension. Sugar softens the high acidity of cider vinegar, shifting the overall profile toward a balanced sweet-and-sour medium.
Temperature affects viscosity significantly. Let the chilled jar sit at room temperature for 15 minutes before serving to loosen the cold oil.