In a medium mixing bowl, stir together flour, powdered sugar, and salt. Cut in butter till crumbly. Press mixture evenly into bottom of 13x9x2-inch baking pan. Bake in a preheat 350F oven for 10 minutes.
In another mixing bowl, beat eggs slightly. Stir in the brown sugar, pecans, honey and melted butter. Stir together the half and half , coffee crystals, and vanilla till coffee crystals dissolve, Stir into pecan mixture. Spread evenly over hot crust.
Bake in 350F oven for 20 minutes more, or till set. Cool in pan on a rack. Cut in squares, then halve the squares, diagonally to make the triangles.