1	Crush garlic, 1 tbsp peppercorns, allspice and ½ tsp coriander seeds in a mortar and pestle until a coarse paste forms, transfer to a large saucepan with salt, sugar, vinegar, ½ tsp yellow mustard seeds, cayenne pepper, ground ginger and 2½ litres water. Bring to the boil over medium heat, stirring to dissolve sugar. Remove from heat, cool completely.
2	Place brisket in a large non-reactive container, pour over liquid, cover and refrigerate for 3 to 5 days to cure.
3	Preheat oven to 130-140C. Remove brisket from liquid (discard liquid) and place in a large casserole. Cover completely with water, bring to the boil over medium heat, cover with baking paper and lid, cook in oven until tender (3-4 hours). Cool brisket in liquid, refrigerate until completely chilled (3-4 hours).
4	Drain brisket (discard liquid), pat dry with absorbent paper, brush with molasses. Coarsely grind remaining peppercorns, coriander seeds and yellow mustard seeds in a mortar and pestle, then press onto all sides of brisket and refrigerate, covered, until required. Pastrami will keep refrigerated in an airtight container for 1 week.
5	For coleslaw, place cabbage, carrot and onion in separate non-reactive bowls. Bring vinegar, sugar and 120ml water to the boil in a saucepan, stirring to dissolve sugar. Divide among bowls, refrigerate until chilled (15-20 minutes). Drain well (discard liquid), combine in a bowl with oil, season to taste, set aside.
6	To serve, spread half the bread slices with mustard, layer with thinly sliced pastrami and coleslaw, season to taste, top with remaining bread slices and serve immediately.

Note Tellicherry peppercorns are high-quality whole black peppercorns. You can substitute another type. Wagyu brisket is available from specialist butchers. You will need to order ahead. You can substitute regular brisket.

Drink Suggestion A hoppy, Pilsner-style lager.