The famed Ed Giobbi recipe mixes the ricotta with eggs pecorino romano cheese and dried parsley. The béchamel type sauce (with a touch of nutmeg) is added to the homemade marinara sauce. I used to be able to buy 5l lb rolls of frozen spinach lasagna in NYC. In remote TX I’m reduced to using 2 expensive packages of dried spinach lasagna. But it’s worth it. The Ed Giobbi recipe Is too long for posting here but is readily Googled (if only I knew how to post the link using this iPhone).
ps. I readily disclose my caffeine consumption but have never told my cardiologist about my craving for this lasagna.
FWIW Erato released a 3 disk recording of Agrippina late last year with - you guessed it - Joyce DiDonato. This is strictly an "early-music" version with Maxim Emelyanychev leading Il Pomo d'Oro. Instead of Kate Lindsey you get countertenor Franco Fagioli as Nerone and hunk countertenor Jakub Jozef Orlinski as Ottone. It's quite good! It's available on Amazon for $27 or you can stream or download it from the IDAGIO app. There's also a great brief YouTube video on the making of this recording. I'm still hopping the Met's Live in HD broadcast makes it to their On-Demand library soon.