Warm beef salad with spinach and herb dressing

Ingredients

• 500 gram baby new potatoes
• 600 gram rump steak, trimmed
• 2 teaspoon celery salt
• 80 gram baby spinach leaves
• 1/2 cup loosely packed flat-leaf parsley leaves
• 1 teaspoon dijon mustard
• 2 tablespoon olive oil
• 1 teaspoon grated lemon rind
• 2 tablespoon lemon juice
• 1 teaspoon caster sugar
• salt and freshly ground black pepper
• 200 gram grape tomatoes, halved
• 250 gram frozen broad beans, cooked, peeled