Welsh rabbit

将以上材料先烧化黄油，然后加入面粉制作roux。断生后依次加入黑啤、重奶油、调味料和芝士。 制作好的芝士酱应该是偏稀的（放冷后会进一步稠化）。 提前烤脆吐司，厚切最好。然后淋上芝士酱，烤箱烤到焦黄上色。 食用时可再次淋少量辣酱油。 原方https://m.youtube.com/watch?v=LszyhaXVesM Ingredients: - 2 tablespoons unsalted butter - 2 tablespoons all-purpose flour - 1 teaspoon mustard powder or 1 tbsp English, mustard - 1/2 teaspoon cayenne pepper optional - I used paprika - 1/2 teaspoon Worcestershire sauce - 1/2 cup to start with dark beer, like a stout or porter or as much as you like - 2/3 cup heavy cream - 1 1/2 cups grated sharp cheddar cheese - 4 slices of thick bread, toasted - Salt and freshly ground black pepper to taste