The answer is to bring light from above the worktop itself. Either a roof window or a flat unit set over the counter lights the surface where chopping and pouring take place, and it removes the shadow cast by your own body when you stand at the window end. Beneath a sloping roof, set a roof window into the slope; on a flat-roofed extension, use a flat rooflight.
The position is worked out by looking at the room as it is used. Where is the hob? Where do you stand to prepare food? Is there an island or a table that wants light too? We chalk the proposed edges of the opening on the floor and the ceiling so the position can be judged by eye before an order goes in.
Glass and tiling behind the worktop reflect more light than dark units, and a white or pale splashback helps a rooflight do its job. We do not tell people how to design a kitchen, but a quick note at the survey about finishes costs nothing and sometimes saves a second lamp.
Heat and steam matter over a hob. A roof window that opens lets cooking steam out, and an electric opening version removes the need to reach a handle above a worktop. A fixed unit is simpler but gives no ventilation, so an opening one is the usual choice for a hob. In a flat-roofed extension, an opening rooflight can serve the same purpose.
If you work at the sink more than the hob, we light the sink. If the table is where the household gathers, we may suggest a second unit. Every choice starts with the spot and the way you use it, and the quote lists each unit as its own line.
Light the counter where you stand, not the middle of the floor.