Welsh Rarebit with Leeks On Toasted Crumpets

1. reserve 5ml/1tsp of the butter & melt the rest in a pan. add the flour & cook for a minute over a medium heat. gradually add the milk, stirring, until you have a smooth, thick sauce. add the ale, cheese & mustard, & stir until smooth. cool a little to allow to thicken.
2. slice the leeks & lightly saute in the reserved butter until softened.
3. place bunches of the cherry tomatoes under a medium grill, cook until softened.
4. toast the crumpets. place on a grillproof plate or baking sheet, top with the leeks & spoon the sauce over. cook under the grill until bubbling & golden. serve with the cherry tomatoes.