01 - Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving some overhang for easy removal.
02 - In a small saucepan, combine raspberries, sugar, and lemon juice. Cook over medium heat, stirring occasionally, until raspberries break down and mixture thickens (about 5 minutes). Press through a fine-mesh sieve to remove seeds. Set aside to cool.
03 - In a heatproof bowl set over a pan of simmering water, melt butter and chocolate together, stirring until smooth. Remove from heat and cool slightly.
04 - Whisk sugar into the chocolate mixture, then add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - Sift in flour, cocoa powder, and salt. Gently fold until just combined—do not overmix.
06 - Pour brownie batter into the prepared pan and smooth the top.
07 - Drop spoonfuls of raspberry puree over the batter. Use a knife or skewer to gently swirl the raspberry into the brownie mix, creating a marbled pattern.
08 - Bake for 30–35 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
09 - Cool completely in the pan, then lift out and cut into squares.