Open Face Steak Sandwich with Onions & BBQ Sauce

2 ½ lb. piece hanger steak, at room temperature

For drizzling: olive oil

2 ciabatta rolls, halved horizontally

2 Spanish onions, thickly sliced

2 vine-ripened tomatoes, thickly sliced

To serve: good-quality mayonnaise

1 cup (loosely packed) wild rocket

 

Barbecue sauce

 

2-3 T. butter, coarsely chopped

2 onions, finely chopped

2 garlic cloves, finely chopped

½ C. Kentucky bourbon

1 ½ C. tomato sauce

1 C. each tomato passata and cider vinegar

¾ C. brown sugar

1/3 C. Worcestershire sauce

¼ C. molasses

3 canned chipotle chilies in adobo

1 T. chipotle Tabasco

Juice of 1 lemon

 

For barbecue sauce, heat butter in a large saucepan over low heat, add onion and garlic and stir occasionally until very tender (10-15 minutes). Increase heat to medium, add bourbon, bring to the simmer, then add remaining ingredients except lemon juice. Reduce heat to low and stir occasionally until thick and dark (45-50 minutes). Add juice, season to taste, pour into sterile containers or jars, seal and refrigerate to cool. Makes about 1 litre. Barbecue sauce will keep refrigerated for 3 weeks in a sterile airtight container. Preheat a barbecue to medium heat. Drizzle steak with a little olive oil, season to taste and barbecue, turning frequently, until cooked to your liking (15-20 minutes for medium-rare). Set aside to rest for 10 minutes then thickly slice. Meanwhile, drizzle cut sides of ciabatta with a little oil, season to taste, grill on barbecue until toasted (1-2 minutes), set aside.  Drizzle onion with a little oil, season to taste and barbecue on the flat plate, stirring occasionally, until tender (5-10 minutes).  Spread cut-sides of ciabatta with mayonnaise, divide steak among ciabatta, top with tomato, onion and rocket, season to taste and serve with barbecue sauce.