1. Preheat the oven to 400 F. Lightly oil an 8-inch square deep cake pan and line the bottom with wax paper.
2. Place the margarine and 3 tablespoons of the honey in a saucepan and heat gently until melted. Reserve 1 tablespoon lemon juice, then stir in the rest with the lemon rind and milk.
3. Stir together the flour, baking powder and nutmeg, then beat in with the semolina. Whisk the egg whites until they form soft peaks, then fold evenly into the semolina mixture.
4. Spoon into the pan and sprinkle with sesame seeds. Bake for 25-30 minutes, until golden brown.
5. Mix the reserved honey and lemon juice and drizzle over the cake while warm. Cool in the pan, then cut into bars to serve.