12eggs12thick slices leg ham off the boneTo serve:chervil sprigsEnglish muffins1 tbsp (14gm; about 2 sachets)dried yeast Pinchof caster sugar600 gm (4 cups)plain flour310 ml (1¼ cup)milk, warmed1egg40 gmbutter, meltedFor dusting:polentaHollandaise250 ml (1 cup)white wine vinegar1 bunchtarragon, torn4golden shallots, finely chopped3egg yolks250 mlwarm clarified butter
For English muffins, combine yeast, sugar and 60ml lukewarm water in a bowl and stand until foamy (5-10 minutes). Add flour, milk, egg, butter and 1 tsp sea salt to yeast mixture, mix well to combine. Turn onto a floured surface, knead until smooth and elastic (3-5 minutes). Place in a greased bowl, cover with plastic wrap, stand until doubled in size (40-50 minutes). Preheat oven to 180C. Dust a work surface with polenta. Knock back dough, scatter with polenta, then roll to 1cm thick. Cut out muffins using a 9cm-diameter cutter (re-roll scraps) and set aside to prove slightly (10 minutes). Heat a large frying pan over medium heat then toast muffins, in batches, wiping pan clean between batches, until golden (5-10 minutes). Transfer to an oven tray and bake, turning once, until cooked through and puffed (8-10 minutes). Set aside.
For hollandaise, combine vinegar, tarragon and shallot in a small saucepan and cook over medium-high heat until reduced to 50ml (15-20 minutes). Strain through a fine sieve into the bowl of an electric mixer, pressing to extract liquid. Add yolks, then place bowl over a saucepan of simmering water and whisk until pale. Transfer to mixer, add 20ml hot water and, while whisking, gradually add clarified butter in a thin steady stream until thick and pale. Keep warm.
Preheat a grill to high heat. Poach eggs in a saucepan of simmering water until soft-poached (3 minutes). Drain.
Grill ham on an oven tray to warm (2-4 minutes), halve muffins and grill, turning occasionally, to lightly toast (2-4 minutes). Place ham on muffin bases, top each with a poached egg. Spoon hollandaise over, garnish with chervil, sandwich with muffin tops and serve.