Roast Silverside of Beef with Yorkshire Puddings and Gravy

Ingredients

• 1.5 kg boned and rolled Scotch Beef silverside
• 1 tbsp beef dripping or butter
• 1 tsp salt and some freshly ground black pepper
• 8-12 small red onions, peeled and slit in a cross at the pointed end (so that they do not burst in the oven)
• 4 heads garlic, halved horizontally
• A few sprigs of thyme
• 225 g plain flour
• Pinch salt
• 2 medium eggs
• 300 ml milk mixed with 200 ml water
• Beef dripping
• For the gravy to add to the pan juices:
• 100 ml red wine
• 2tbsp port (or redcurrant jelly)
• 100 ml water
• 1 tbsp Dijon or English mustard
• Buttered spinach to serve.