Stir together freshly prepared espresso, 1tbsp of sugar and Tia Maria in a shallow bowl until sugar dissolves; let cool.
Beat egg yolks, Marsala and remaining 1/2 cup of sugar in a metal bowl set over a saucepan of barely simmering water using a whisk or handheld mixer (This made me nervous because I've never used my mixer to beat something over the stove but it was ok. Just make sure that the cord of your mixer stays clear of the flame/heat. Also, make sure your water is not boiling or your egg might cook too quickly and become lumpy).
Beat until it has tripled in volume (5 to 8 minutes)
Remove bowl from heat stir, scraping sides of bowl and allow to cool slightly.
Beat in Mascarpone until combined. (You can pre-beat the mascarpone to soften it a little before adding it in.)
In a separate large bowl, whip the cream until you get stiff peaks.
Fold mascarpone mixture into whipped cream gently but thoroughly.
Quickly dipping both sides of each ladyfinger into the coffee mixture, line the bottom of the baking dish with 18 ladyfingers in 3 rows. (trimming edges if necessary) SEE NOTE! Dip for 1 sec per side. DO NOT SUBMERGE :)
Spread half the mascarpone filling on top. Dip remaining 18 ladyfingers in coffee and arrange over filling in the dish.
Spread remaining mascarpone filling on top
Dust lightly with cocoa then sprinkle with Turbinado sugar
Chill, covered for at least 6 hours.
Let Tiramisu stand at room temperature for 30 minutes before serving.
Tiramisu can be chilled up to 2 days.
Yolks may not be fully cooked.