Beef Roulade with Celeriac Puree - Simple Seasonal

Ingredients

• 1 1/2 lbs flank steak
• 1 Tbsp butter
• 1 C diced shallots
• 1/2 lb baby tatsoi or spinach
• 1/3 C diced sun-dried tomatoes
• 1 1/2 Tbsp olive oil
• salt and fresh cracked pepper to taste
• 2 1/2 lbs celeriac
• 1/3 C light cream
• salt and pepper to taste
• 1 1/2 C beef broth
• 2 Tbsp corn starch