PREHEAT oven to 400°F.
SLICE sausage into bite-sized pieces.
CUT potatoes in quarters. *Tip: if you are working with blood sugar issues, you might consider soaking your potatoes in water for at least 20 minutes before assembling the seafood bake.
SLICE lemons into medium-thin rounds (about 6-7 slices per lemon).
MAKE packets by using a baking sheet to lay out a piece of aluminum foil about 12" long and 6" wide for each person you're serving; everybody will get their own little "envelope."
PLACE a handful of shrimp, a handful of scallops, a handful of sausage, and a handful of potatoes in the middle of each aluminum foil sheet. This doesn't need to be precise! Basically, you just want to evenly distribute the protein and potatoes across each serving.
SPRINKLE your protein and potatoes generously with your Whole30 -compatible seafood seasoning. Again, this is to taste! Use as much or as little as you like.
COVER the protein and potatoes with lemon slices and rosemary or basil.
STARTING with the long sides of your tin foil first, join your packets at the top, then roll slightly to close. Close ends in a similar fashion until you have an "envelope" of tin foil with your seafood bake inside. Leave enough space and air at the top (over the seafood) so steam can gather.
BAKE for 30 minutes then plate OR eat right out of the packet for minimal clean-up!