A method of processing a hydrocarbon feed that is middle distillates boiling in the range of 180°C to 400°C to remove undesired aromatic and non-aromatic organosulfur compounds, the method comprising: subjecting the hydrocarbon feed to a hydrotreating process under mild operating conditions including a temperature of 320°C to 380°C, a reaction pressure of 20 to 100 bars, a hydrogen partial pressure of less than 55 bars, a feed rate of 0.5 hr -1 to 10 hr -1, and a hydrogen feed rate of 100 L/L to 500 L/L to thereby lower the content of labile organosulfur compounds and produce a hydrotreated effluent; conveying the hydrotreated effluent and an effective quantity of extraction solvent to an extraction zone to produce an extract containing a major proportion of the aromatic content of the hydrotreated effluent and a portion of the extraction solvent and a raffinate containing a major proportion of the non-aromatic content of the hydrotreated effluent and a portion of the extraction solvent; wherein the extraction solvent is selected from the group consisting of furfural, N-methyl-2-pyrrolidone, dimethylformamide and dimethylsulfoxide; separating at least a substantial portion of the extraction solvent from the extract and retaining an aromatic-rich fraction, separating a portion of the extraction solvent from the raffinate and retaining an aromatic-lean fraction, contacting the aromatic-rich fraction with an oxidizing agent and an oxidizing catalyst to convert aromatic organosulfur compounds to oxides; decanting in a decanting vessel the stream of oxidizing catalyst, oxidized sulfur-containing compounds and oxidized aromatic-rich fraction to separate water and oxidizing catalyst from the oxidized sulfur-containing compounds; removing oxidized sulfur-containing compounds from the oxidized aromatic-rich fraction by counter-current solvent extraction and contacting the solvent extracted aromatic-rich fraction with adsorbent material in an adsorption column; combining the aromatic-lean fraction and the effluent from the adsorption column; and recovering an ultra-low sulfur level hydrocarbon product. subjecting the hydrocarbon feed to a hydrotreating process under mild operating conditions including a temperature of 320°C to 380°C, a reaction pressure of 20 to 100 bars, a hydrogen partial pressure of less than 55 bars, a feed rate of 0.5 hr -1 to 10 hr -1, and a hydrogen feed rate of 100 L/L to 500 L/L to thereby lower the content of labile organosulfur compounds and produce a hydrotreated effluent; conveying the hydrotreated effluent and an effective quantity of extraction solvent to an extraction zone to produce an extract containing a major proportion of the aromatic content of the hydrotreated effluent and a portion of the extraction solvent and a raffinate containing a major proportion of the non-aromatic content of the hydrotreated effluent and a portion of the extraction solvent; wherein the extraction solvent is selected from the group consisting of furfural, N-methyl-2-pyrrolidone, dimethylformamide and dimethylsulfoxide; an extract containing a major proportion of the aromatic content of the hydrotreated effluent and a portion of the extraction solvent and a raffinate containing a major proportion of the non-aromatic content of the hydrotreated effluent and a portion of the extraction solvent; wherein the extraction solvent is selected from the group consisting of furfural, N-methyl-2-pyrrolidone, dimethylformamide and dimethylsulfoxide; separating at least a substantial portion of the extraction solvent from the extract and retaining an aromatic-rich fraction, separating a portion of the extraction solvent from the raffinate and retaining an aromatic-lean fraction, contacting the aromatic-rich fraction with an oxidizing agent and an oxidizing catalyst to convert aromatic organosulfur compounds to oxides; decanting in a decanting vessel the stream of oxidizing catalyst, oxidized sulfur-containing compounds and oxidized aromatic-rich fraction to separate water and oxidizing catalyst from the oxidized sulfur-containing compounds; removing oxidized sulfur-containing compounds from the oxidized aromatic-rich fraction by counter-current solvent extraction and contacting the solvent extracted aromatic-rich fraction with adsorbent material in an adsorption column; combining the aromatic-lean fraction and the effluent from the adsorption column; and recovering an ultra-low sulfur level hydrocarbon product.