After that try I gave up on that recipe and went back to Tartelette's recipe that I've made successfully before, but I only had maybe 1/4 amount almonds, so I used that little bit of almonds and supplemented the remainder with hazelnuts. Tartelette recommends using at least half almonds, but mine worked perfectly even with far more hazelnut than almond. I used Veronica's Caramel Fleur de Sel Recipe (except just with Kosher salt!-aka salted caramel). It is good enough to eat with a spoon. It is sweet and salty and not too rich. It is the perfect combo of flavors, and the consistency is smooth and thick. Delicious. It tasted great with the macarons. My only complaint is that they are so sweet! I measure everything out by weight, so I'm not sure if it's something I'm doing or if they're just super sweet by nature, but it's borderline too much! I think I'd enjoy them more with a bit more nut flavor and less sweetness. I want to try more flavors, because I liked the taste of the strawberry and chocolate ones, even though they did not work out well. For a beginner baker they may be intimidating, there are a lot of steps that require a certain amount of precision. I believe weighing the ingredients makes it more accurate and turns out a better recipe. Also good ideas are baking them in low humidity, because higher humidity increases failure rates according to what I've seen. As for the aged egg white question: I used both aged and microwaved in my attempts. I didn't see a lot of difference, but I would recommend one or the other instead of using fresh whites. If pressed for time, just pop them in the microwave for 5 seconds, twice.
Preparation time: Not taking into account the amount of time it takes for you to bring your egg whites to room temperature, the whole baking process, including making the batter, piping and baking will probably take you about an hour to an hour and a half. How long it takes to make your filling is dependent on what you choose to make.
Actual baking time: 12 minutes total, plus a few minutes to get your oven from 200°F to 375°F.
Yield: 10 dozen. Ami's note: My yield was much smaller than this. I produced about two dozen filled macaroons.