Grate one teaspoon of orange zest into a small jar. Add the olive oil, white balsamic vinegar, honey, salt, pepper, and the juice you caught while prepping the oranges. Shake vigorously until the honey is fully dissolved. This creates a bright, emulsified dressing that clings perfectly to the mixed greens and shaved fennel.
Thinly shave the fennel bulbs and slice the celery on a sharp diagonal. Submerge both in a bowl of ice water for 10 minutes. This professional trick ensures the vegetables stay incredibly crisp and develop a beautiful curl that adds height and texture to your high-protein vegetarian salad.
Cut the peel and pith away from the oranges. Carefully slice between the membranes to release the clean segments (supremes). This ensures every bite of your salad is juicy and sweet without any of the tough, chewy bits that can distract from the delicate fennel shavings.
Place your sliced red onions in cold water for five minutes. This removes the harsh “bite” of the raw onion while preserving its vibrant purple color and crunch. Pat them dry along with the fennel and celery to ensure the honey-citrus dressing doesn’t get watered down.
Heat your pecans or pistachios in a dry skillet over medium heat for 3 to 5 minutes until they are fragrant. Let them cool completely on a separate plate. Adding toasted nuts provides a deep, savory element and essential healthy fats, making this a truly satisfying vegetarian dish.
In a large bowl, gently toss the mixed greens, fennel, and celery with the dressing. Fold in the orange segments, onions, and fresh mint. Transfer to a platter and top with the toasted nuts and reserved feathery fennel fronds. Serve immediately to maintain the signature crunch of the vegetables and the loft of the greens.