01 - Line an 8x8-inch square pan with parchment paper, allowing overhang on sides for easy removal.
02 - Combine dark chocolate chips and 2 tablespoons coconut oil in a heatproof bowl. Melt using a double boiler or microwave in 30-second intervals, stirring until completely smooth.
03 - Whisk in 2 tablespoons maple syrup, vanilla extract, and sea salt until the mixture becomes glossy and well combined.
04 - Pour the chocolate mixture into the prepared pan, using a spatula to create an even layer across the bottom.
05 - In a separate bowl, whisk together tahini, remaining 2 tablespoons maple syrup, melted coconut oil, and sea salt until smooth and creamy.
06 - Spoon dollops of the tahini mixture evenly over the surface of the chocolate base.
07 - Drag a butter knife or skewer through the dollops in a swirling motion to create a marbled pattern, being careful not to overmix.
08 - Gently tap the pan on the counter to release any air bubbles and level the surface.
09 - Transfer the pan to the freezer and chill for at least 2 hours until completely firm throughout.
10 - Lift the fudge from the pan using the parchment overhang. Cut into 16 small squares and store in an airtight container in the freezer.