Summer still catwalks through the August air, unabashed and sizzling. There’s still time to grill, still time to sit out under the stars without a coat, or even a hoodie. There’s time to wear out those flipflops and kick back in sunglasses. And there’s still time to try Uganda’s kebabs, adapted  from Marcus Samuelsson’s beautiful cookbook Discovery Of A Continent – Foods, Flavors, And Inspirations From Africa.  The flavors are intense. Bright lemon juice starts of the explosion. A long marinade brings out bright sparks from the citrus. Then there’s a needling burn from the Harissa, a traditional spice often found in North African cooking. How much heat is there? As much as you can handle. Or as little as you’d like. Tip: You find Harissa mix at Whole Foods in the spice aisle (to be combined with water, olive oil, and crushed garlic), or you can buy a canned paste at a Middle Eastern market. Be sure to add this to taste, as some mixes may be spicier than others. IF you use the …