Tangy Broccoli-Potato Salad
["2 large potatoes, cubed", "1 pkg. frozen broccoli spears, thawed or 1 bunch fresh broccoli, cut up", "2 Tbsp. chopped fresh parsley", "3 Tbsp. white vinegar", "1 Tbsp. olive oil", "1 tsp. horseradish", "2 garlic cloves, minced", "2 green onions, thinly sliced", "1 hard-boiled egg (with or without yolk), diced"]
["Boil potatoes until tender (10 minutes); drain.", "Steam or microwave broccoli until tender."]
["potatoes", "frozen broccoli", "parsley", "white vinegar", "olive oil", "horseradish", "garlic", "green onions", "egg"]