Fill a pan with 1" water and place in oven. Preheat oven to 350°F. Mix crust ingredients and press at bottom of 6" pan with removable bottom. Bake about 10min until toasted (or follow instructions from recipe of choice). Melt chocolate and 1tsp water over double boiler. Mix sugar and corn starch, then add remaining ingredients in order, incorporating eggs last, scraping each time to avoid lumps. Add a few tablespoons batter into the melted chocolate, and stir until smooth. Pour the chocolate into the batter and mix well. Pour on top of crust and bake one hour, then turn off oven and leave to cool in over another hour.