In a medium sized bowl, whisk together the egg yolks, whole milk, 1/2 cup of sugar, and vanilla bean seeds. Heat the custard mixture in the top pan of a double boiler over medium heat, whisking constantly for about 30 minutes, until it's thick enough to coat a wooden spoon. Don't let the custard boil. Once it has thickened, cover and refrigerate it for about 2 1/2 hours, until completely cool.
RASPBERRY JAM SAUCE:
In a small pot, bring the water to a boil. Take it off the heat and mix in the raspberry jam. Set it aside.
Using a hand mixer, whip the cream with 1/2 cup of raw sugar until stiff peaks form. Set it aside.
SHKIAFFING IT TOGETHER:
Dip one side of each slice of pound cake in the sherry. Place a single layer of sherry-dipped pound cake onto the bottom of the trifle dish. Pour in enough custard to just barely cover the cake slices. Delicately disperse 4 teaspoons of the raspberry jam sauce and 2 heaping tablespoons of the defrosted raspberries on top of the custard. Repeat this layering until the trifle dish is full. Once the dish is full, use a butter knife to poke vertical channels into the trifle. Top the trifle with the whipped cream, and decorate it with fresh raspberries. Refrigerate it for about an hour to set.