Preheat oven to 350ºF (170ºC).

Using an electric hand mixer on high speed, cream together butter, sugar and tahini until it all lightens in color.

Add vanilla, then eggs, one at a time, beat on high for 5-7 minutes, until the mixture is light and fluffy.

Add all-purpose einkorn flour sifted with baking powder (I use a medium sieve for for sifting).

Mix on low speed until no dry bits remain. Transfer batter to a non-stick 8x4" loaf pan (I use this one). Sprinkle with sesame seeds. Bake for 30-35 minutes. Cool slightly before removing from the pan.