Slice the celery head thinly on a sharp diagonal and place in a large bowl. Core the apples and cut them into matchsticks, then toss them immediately with a squeeze of lemon juice to prevent browning. Peel the celery root and julienne it into 2-inch long strips. Roughly chop the toasted almonds and finely chop the fresh dill. Have your parsley and blue cheese ready. This prep work takes just a few minutes and ensures everything comes together smoothly.

In a small bowl, whisk together the olive oil, minced shallot, Dijon mustard, lemon zest, lemon juice, and sugar until fully emulsified. Season with salt and pepper to taste. I like to use a good peppery olive oil here—it adds a subtle depth that complements the sharp blue cheese beautifully. The mustard acts as an emulsifier, helping the vinaigrette cling to the vegetables.

Pour the vinaigrette from Step 2 over the prepared celery in the large bowl and toss gently but thoroughly to coat all the pieces evenly. Add the apple matchsticks, celery root julienne, parsley, dill, almonds, and half of the crumbled blue cheese. Toss everything together gently to combine, being careful not to break up the delicate vegetables. Taste and adjust seasoning with additional salt and pepper as needed.

Transfer the salad to a serving bowl or plate. Top with the remaining blue cheese crumbled over the surface, allowing some of it to nestle into the vegetables. Garnish with additional fresh parsley and any tender celery leaves if available. I recommend using Roquefort for its boldest flavor—the creamy, tangy richness is the perfect foil to the crisp, fresh vegetables and bright lemon vinaigrette.