Apple-Marjoram Open Faced Sandwich

Scrub potatoes and cook in a pot of boiling salted water until knife-tender, 20-30 minutes, depending on size.

Meanwhile, rinse marjoram and shake dry. Pluck leaves, put some aside and finely chop the rest.

Halve leek lengthwise, rinse well, drain and cut white-part into approximately 1/4-inch slices. (Reserve remaining leek greens for another use.)

Rinse apple, wipe dry and cut around the core into slices approximately 1/4 inch thick. Finely dice the apple slices.

Heat oil in a non-stick pan. Add leek, cover and cook over low heat until softened, about 6 minutes.

Add diced apple and chopped marjoram and sauté for 1 minute. Season with salt and pepper.

Drain the potatoes, rinse under cold water, peel while still warm and pass through a potato ricer into a bowl.