Stir together all ingredients except eggs. Mix well. Gently stir in eggs. Cover and chill at least 2 hours.: When you whisk the mayonnaise , grated onion , chopped dill , chopped dill pickle, prepared mustard , pepper , and salt together, you will notice a creamy emulsion forming that smells bright and savory. This step lets the acidic and herby elements integrate, so each spoonful will be balanced. If the mixture tastes too sharp, it will mellow after chilling. A common pitfall is under mixing, which leaves pockets of mustard or salt, so whisk until the texture is uniform.
Spread on desired bread and serve.: After the ingredients start to come together, the texture should feel smooth and cohesive on your spoon, with flecks of green and tiny bits of pickle visible. The sound is quiet, a soft scrape as you fold; visually you want no separate puddles of oil or mustard. Mixing well ensures the seasoning is distributed evenly. Avoid overbeating, which can thin the mixture and make it slippery rather than spreadable.
Gently stir in eggs: The chopped hard boiled eggs should be folded in gently so they stay in small, tender pieces rather than becoming mush. You will feel a light resistance as you fold, and the final texture should be chunky yet cohesive. This technique preserves contrast between creamy dressing and the soft egg bits, which is essential for mouthfeel. A frequent mistake is aggressive stirring that turns the salad into a paste, so use a gentle hand and short strokes.
Cover and chill at least 2 hours: Chilling lets the flavors marry and the dressing firm up, giving the salad body and depth. As it cools, the dill aroma softens and the pickle tang integrates, creating a more rounded profile. You will notice a subtle tightening of texture when it is properly chilled. Do not skip chilling, as serving it immediately often results in a flatter, less cohesive flavor. One troubleshooting tip is to taste after an hour and adjust seasoning before the full chill if needed.
Spread on desired bread and serve: When you spread the chilled salad onto bread, the contrast between the cool filling and room temperature bread is delightful. The visual cues are a neat, spreadable mound that holds shape without sliding. I recommend using a firm, slightly toasted bread for structure. A common error is using soggy or overly soft bread, which can turn the sandwich into a mess; if your bread is delicate, serve the salad on lettuce or open faced to preserve texture.