1. Break the dark chocolate into small pieces
2. Butter cut into small pieces
3. Heat over water until it melts into a liquid state (occasionally microwave oven). After taking it out, cool to about 30°C (not hot).
4. Take another large bowl, beat in the eggs (remove to warm up in advance), beat them up, don't make too much foam.
5. Pour granulated sugar and salt into the beaten eggs and mix well.
6. Add a few drops of vanilla extract and mix well.
7. Pour the butter-chocolate mixture into the mixture of 3 and mix well.
8. Sift in the high-gluten flour, stir evenly with a rubber spatula, and the brownie batter is almost complete.
9. Pour the chopped walnuts into the brownie batter and stir again.
10. Fold up four sides of A4 paper to make a rectangular cake mold, put tin foil on the inside, and pour the brownie batter into it
11. Put it into the preheated oven, 190℃, middle level, and heat up and down for 35min.
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