Step 1

In a medium saucepan, whisk eggs, sugar, cornstarch and mustard powder. Stir in vinegar and water.

Step 2

Heat over medium heat, whisking frequently, until thickened (about 5 minutes). Remove from heat. Stir in mayonnaise. Set aside to cool.

Step 3

Add broccoli florets to a large bowl. Pour in cooled dressing and stir to combine. Let sit for 2 hours in the fridge to marinate.

Step 4

Stir in remaining ingredients and serve.