Preheat oven to 375.
Toss sweetpotato rounds in a bowl with oil; Coat with salt, coriander and ground cumin.
Spread rounds on a sheet pan in single layer (as much as possible); Roast for 12-15 minutes till golden and fully cooked.
Remove rounds from oven and set aside.
Combine the sliced onions with jalapenos, ginger and salt; Toss with vinegar and lemon juice and set aside.
Core and dice the tomato and put in a bowl with salt and lime juice.
In a small pan, heat extra virgin olive oil till hot and add whole cumin seeds; When they are sizzling and just turning brown, pour this hot oil mixture over the tomatoes and combine, then set aside.
In a sauté pan, heat the remaining olive oil. Add chopped garlic and when fragrant, add the drained black beans and season with salt. Cook while stirring for a couple of minutes. Add chipotles and honey with a little water. Fold to combine. Taste for salt and remove from heat.
On a griddle or cookie sheet, spread a layer of the roasted sweetpotatoes. Spoon some black beans all over and top with cheese. Repeat for at least one more layer. Put in oven (still at 375) till cheese is melting and bubbly.
Serve on the skillet or simply lift the whole thing from the pan onto a wide plate. Top with crema, pickled onions and tomato- be sure to get some of the tomato juice onto the dish!