Roasted Bone Marrow With Sweet And Sour Shallots And Buttermilk Recipe

Ingredients

• 2 EU Premium Black Angus Beef Bone Marrow

• 185 ml Beef Stock with Red wine (¾ cup)

• 4 thick slices sourdough, toasted, halved crossways (8 pieces total)

• Finely chopped chives, chive batons and chervil, to serve

Sweet and sour shallots

• 185 ml sherry vinegar (¾ cup)

• 185 ml white wine vinegar (¾ cup)

• 2 tbsp caster sugar

• 2 tbsp light brown sugar

• 8 golden shallots, finely chopped

Buttermilk purée

• 250 ml buttermilk

• 150 ml thickened cream

• 4 gm agar-agar

• ¼ tsp xanthan gum

Instructions

1. For sweet and sour shallots, bring vinegars, sugars and 1½ tsp salt to the boil in a saucepan, whisking to dissolve sugar. Stir in shallot, reduce to a simmer & cook, stirring occasionally, until reduced to a jammy consistency (20-25 minutes). Cool to room temperature, cover & refrigerate until required.
2. For buttermilk purée, process buttermilk, cream & agar-agar in a high-speed blender for 30 seconds, transfer to a large saucepan, bring to the boil & boil for 1 minute to hydrate agar-agar. Pour into a wide shallow pan & refrigerate until set (1¾-2 hours). Break into smaller pieces, transfer to a blender & process on high speed until smooth. Sprinkle in xanthan gum & ½ tsp salt & blend to combine. Transfer to a squeeze bottle or piping bag & refrigerate until required.
3. Preheat a grill to high. Drain marrow bones & pat dry with paper towels. Place cut-side up on a wire rack in a roasting pan, season to taste & grill on a low rack until heated through and the tip of a small knife inserted into marrow for 20 seconds feels hot (6-7 minutes), then grill closer to heat until top of marrow is golden brown (2 minutes).
4. Combine demi-glace & ¼ cup sweet & sour shallots in a small saucepan & bring to the boil. Simmer until reduced by half (4-5 minutes). Brush a little on bone marrow, & scatter bone marrow with finely chopped chives.
5. Spread about 2 tsp sweet & sour shallot on each piece of toast, pipe dots of buttermilk purée on top & scatter with chervil & chive batons & serve with bone marrow.