Salt Beef with Caramelised Onion Bagels and Mustard Sauce

Ingredients

• 1½ kg coarse sea salt
• 500 gm raw sugar
• 1 tbsp crushed juniper berries
• ½ bunch of thyme
• 2 fresh bay leaves
• 1 1/2 kg beef brisket
• 1 tsp black peppercorns
• To serve: mustard cress
• Caramelised onion bagels
• 30 ml olive oil
• 1 onion, finely chopped
• 2½ tsp caster sugar
• 25 gm butter
• 125 ml milk (½ cup)
• 1¼ tsp dried yeast
• 1 egg, separated
• 250 gm bread flour, plus extra for handling (see note)
• Hot mustard sauce
• 25 gm plain flour
• 250 ml milk (1 cup)
• 3 tsp finely grated fresh horseradish or 1½ tbsp prepared horseradish
• 3 tsp hot English mustard
• 2 tsp wholegrain mustard