2d:null 2e:["$","title",null,{"children":"Timeline for pav bhaji ingredients | Vivek Rao | Observable"}] 33:T56a,timeScaleViz = { const height = 150; const svg = d3 .create("svg") .attr("viewBox", [0, 0, width, height]) .attr("width", width) .attr("height", height) .attr("style", "max-width: 100%; height: auto;"); // Create axis const axis = svg .append("line") .attr("x1", padding.left) .attr("y1", height / 2) .attr("x2", width - padding.right) .attr("y2", height / 2) .style("stroke", "black") .style("stroke-width", "2px"); // plot ingredientIntroduction JSON onto x-axis const timePoints = svg .selectAll(".points") .data((d) => Object.values(ingredientIntroduction)) .enter() .append("line") .attr("x1", (d) => timeScale(d)) .attr("y1", height / 2 - 8) .attr("x2", (d) => timeScale(d)) .attr("y2", height / 2 + 8) .style("border", "2px solid black") .style("stroke", "black") .attr("class", (d) => d) .attr("id", (d) => d); // plot labels for trutiConversion const timeLabels = svg .selectAll(".labels") .data(Object.entries(ingredientIntroduction)) .enter() .append("text") .attr("x", (key, val) => timeScale(key[1])) .attr("y", height / 2 + 24) .text((key, val) => key[0]) .style("font-family", "Courier New") .style("font-size", "12px"); // plot ticks axis.append("g").call(d3.axisBottom(timeScale).ticks()); return svg.node(); }34:T4f6,## References The dates of introduction above are taken from the sources below:

Onions: 5,000 years ago, according to this site; 2nd century BC according to KT Achaya's Companion to Indian Food (p. 213–214)
Cauliflower: 1822, by the British, according to this link
Tomatoes: early 16th century by the Portuguese; around 1850–60 again by the British
Potatoes: at least as far back as 1615, according to this link
Bell peppers: Somewhere between 1497 and 1510

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