I imagine massive investments in roads, highways, electricity, water supply and communication (internet, phone), basically a New Deal (FDR) type of program. I suppose to avoid corruption we could employ local businesses who hire local workers to build all that, in an auction for each contract, giving it to the one who offers the lowest price. The question is who determines which contracts are given out, I suppose to avoid conflicts of interests we neither give it to the foreign investors who don't care about the African people, or the local governments who are corrupt, but to a Commission consisting of both: Half representatives of the African Union and half of all foreign investors.
That would create jobs for an emerging African middle class, which then creates a local demand for consumer goods, which gives businesses, whether foreign or African, an incentive to produce those goods in Africa for Africans locally, saving shipping costs. That in turn also creates jobs, and after the infrastructure projects have finished, this will be what's continuing the cycle. And the improved infrastructure will increase growth even more.
The reason Western powers saying they want to end world hunger hasn't worker (or not enough) is because they didn't try enough, they didn't do such a massive imvestment plan but just foreign aid, subsidies to the governments. And they only did that to make them dependent, and then turned around and said they were merely trying to "help" them.
If Africa had its own base of consumers, then increasing wages there would work economocally. But since they don't, all that does is massively decrease the amount of Western companies wanting to settle there.