Start by making the meringue. Add egg whites, cream of tartar, and salt to a mixer, and beat on medium-high speed until soft peaks form. Make sure that your bowl is very, very clean before starting, because any grease will damage your results. If you don't have superfine sugar, you can blend it in a food processor  - I used my NutriBullet - for a few seconds. Make sure not to let it go too long, or it will just turn into powdered sugar. Increase the mixer speed to high, and gradually add the sugar. Whip until stiff peaks form and the mixture is glossy white. 

2. Line a baking sheet with parchment paper. Turn one of your serving glasses upside down and trace the rim on the parchment paper, to create a guide for how large to pipe your meringue. Make 12-15 circles, and turn the paper over so the pencil marks are on the reverse.

3. Spoon the meringue mixture into a piping bag, fitted with an extra large 2D or 1M tip. Pipe roses onto the parchment paper, starting in the center of each circle and moving in a swirl outward. Bake at 200 degrees for 1 hour, on the lowest rack in the oven. When baking time is up, turn off the oven, and prop open the door slightly. Allow meringue roses to dry completely in the oven for about 1 hour. When they're finished, meringues will be dry and light. 

4. While the meringues are baking, make the lemon curd, raspberry sauce, and whipped cream. For the lemon curd, whisk together all ingredients except butter in a small sauce pan. Place pan over low heat, add butter, and whisk consistently for 5-12 minutes, depending on the temperature you're using. Mine took almost exactly 12 minutes. When you can coat a spoon with the curd and leave a mark when you run your finger across the curd on the spoon, it's done. Press curd through a fine-meshed sieve to remove solids (like the zest). Chill completely in the refrigerator before using. This can be make up to a week ahead of time. 

5. For the raspberry sauce, combine frozen raspberries and powdered sugar in a sauce pan over low heat. Stir frequently until the raspberries soften and break down, and the sugar is completely dissolved. Press through a fine-meshed sieve to remove seeds. Store in the refrigerator. This can be made ahead, also. 

6. For the whipped cream, place your mixer bowl and whisk attachment in the freezer for at least ten minutes. Remove from freezer and pour cream and sugar into the bowl. Whip at high speed until the cream thickens and stiff peaks form - this should only take a minute or two. 

7. To assemble the Upside-Down Pavlovas, put whipped cream and lemon curd into piping bags, and pipe alternating layers of cream, curd and raspberry sauce into shot glasses until they're full. To create the layers of raspberry sauce, just drizzle a little with a spoon and tilt the glass to swirl it around and create an even layer. Make sure that the last layer is whipped cream. Just before serving, top each glass with a meringue rose (the meringue will go soft if put on more than a few minutes ahead of time).