Set Sun Oven out to preheat.
Wash the potatoes, put them in a pot with enough cold water to cover them well and bring to a boil.
Trim the green beans and soak them in a large bowl of cold water for 10 minutes.
Bring 4 quarts of water to a boil. Add 1 tablespoon salt. When water returns to a rapid boil, add the drained green beans. Adjust heat so that it boils at a moderate pace. Drain the beans when they are just tender and have lost their raw flavor, 6 to 10 minutes.
Chop the beans until very fine in a food processor; do not puree.
Drain the potatoes when tender. Peel them and pass them through a food mill or potato ricer.
Combine beans, potatoes, eggs, salt, pepper, and marjoram in a large bowl. Mix thoroughly.
Lightly smear the baking pan with olive oil. Sprinkle bread crumbs generously over the bottom and the sides of the pan; invert the pan to shake out excess crumbs.
Put bean and potato mixture into the pan, distributing it evenly and leveling it with a spatula. Top with more bread crumbs and a drizzling of olive oil.
Bake in the SO for about 90 minutes.
Cool on a rack for about ten minutes, run a knife around the edges and carefully release the ring of the pan. Serve warm or at room temperature.