61.   Stir to combine, adding a little of the pasta-cooking water as you go, until the pesto is evenly distributed.

62.   Sweeten with sugar and stir to combine.

63.   Stir in the tomato paste and water, stirring to combine.

64.   Stir to combine.

65.   When butter has melted, add lemon juice, Tabasco, Worcestershire and salt and pepper to taste, and stir to combine.