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Ingredients :
250g butter (牛油)
200g caster sugar (细砂糖)
5 large eggs ~ grade A (鸡蛋)
230 g plain flour (普通面粉)
1tsp baking powder (发粉)
1/2 tsp salt (盐)
1 tbsp instant coffee powder (即溶咖啡粉)
1/2 tsp coffee essence (咖啡香精)
150g toasted walnuts, chopped (烘香核桃,切碎)