Preheat oven to 375 °F. Grease a 9 x 13 baking pan.
Combine Harissa spice blend with hot water. Add 1 tsp of olive oil and stir until mixture forms a smooth paste.
Halve tomatoes lengthwise and arrange, cut side up, in the oiled baking pan. Brush each tomato half with the Harissa paste. Next, cover each spiced tomato half with goat cheese. Bake in the oven for 20 to 25 minutes, or until tomatoes begin to soften and the goat cheese browns on top.
Remove baking dish from oven and transfer roasted tomatoes to a pretty serving dish.
Serve tomatoes, warm or at room temperature, with plenty of pita or crusty bread.