Ingredients

• 1 small shallot, peeled and minced (about 2 tablespoons)
  
• ¹/₂ teaspoon Dijon mustard
  
• 2 tablespoons lemon juice
  
• ¹/₄ cup extra-virgin olive oil
  
• 1 pinch kosher salt
  
• 1 pinch freshly ground black pepper
  
• 2 avocados, halved and pitted
  
• 1 large navel or Cara Cara orange
  
• 1 blood orange
  
• 1 grapefruit (white or pink)
  
• 3 tangerines or mandarins
  
• 1 pinch flaky salt, such as Maldon, for serving