Whisk vinegar, lemon juice, lemon zest, honey, Dijon mustard and garlic in a small bowl. Slowly stream in oil and whisk to emulsify. Season with salt and pepper.
Assembling the Salad
In a large bowl, add the arugula, fennel and apples. Dress salad with vinaigrette, then toss gently. Add gorgonzola and almonds if desired. Serve immediately.