1. Preheat the oven to 400ºF. Generously butter eight 4-ounce ramekins, dust with flour, and shake out the excess. 2. Cut 2 ounces of the foie gras into 8 equal pieces. Combine the port and brandy in a small bowl, add the pieces of foie gras, turning once or twice, and let marinate at room temperature for 20 minutes. 3. Meanwhile, combine the shallots, tarragon, and the remaining 1 cup port in a small saucepan and bring to a boil over medium-high heat. Reduce the heat slightly and boil gently for about 15 minutes, until the shallots are soft and all the liquid has cooked away. Remove from the heat and set aside. 4. Cut the remaining 6 ounces foie gras into 1/2-inch pieces. Put the butter and foie gras in the top of a double boiler or a heatproof bowl and heat over simmering water for 4 to 5 minutes, until the butter and most of the foie gras have melted. Turn off the heat and keep warm over the hot water. 5. Toast the almond flour and garam masala in a skillet over medium heat, stirring and shaking the pan frequently, for about 10 minutes, or until fragrant and golden brown. Transfer to a plate and let cool. 6. Puree the cooked shallots in a blender. Add the almond flour mixture and blend for 1 minute on high speed. Add the salt. With the blender on medium-low speed, gradually add the butter-foie gras mixture. Transfer to a bowl and whisk in the eggs and egg yolk. 7. Divide the mixture among the prepared ramekins. Drop a piece of the marinated foie gras into the center of each. Set the ramekins in a large baking pan and add enough boiling water to the pan to come two-thirds of the way up the sides of the ramekins. 8. Bake for exactly 8 minutes, until the ganache has pulled away from the sides of each ramekin, the edges are lightly browned and look firm, the center is still jiggly when shaken, and a pool of molten foie gras ganache remains in the center – the ganache may not look done at this point, but it is; do not overcook. 9. Carefully remove the ramekins from the water bath and wipe them dry. Gently invert onto plates, if desired. Drizzle a few drops of balsamic vinegar over each ganache, sprinkle with a few grains of fleur de sel, and serve immediately.