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heat oven to 350.
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In a medium mixing bowl, mix egg yolk, vanilla, lemon, flour, tartar using a spoon, whisk, whatever.
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In a large bowl (hint: Use your stand mixer) beat egg whites, salt until it begins to cling to the beater apparatus.
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Add the 2 tbsp sugar and beat until stiff peaks form.
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Butter your baking pan/dish (sides included) and spoon the jam on the bottom.
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Add 1/3 of your whites to the yolk mix, fold. Fold that into the white mix and so on and so forth until mixed but don't over fold- be gentle.
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Dollop it into your baking pan; the tradition is to do three dollops to resemble the three mountain peaks in Salzburg or so I've been told.
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Bake 10-20 minutes until golden and set- you want some "jiggle" not no liquid.it is not a custard but also not quite a souffle, so an in-between consistency or to your liking.
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Dust with powdered sugar and serve warm.