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1
Using vegetable peeler, remove rind from oranges in strips.
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2
Cut rind into matchstick-size strips.
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3
Place strips in small saucepan; cover with water.
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4
Bring to boil.
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5
Drain; rinse with cold water.
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6
Drain.
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7
Combine 2/3 cup water, sugar, and vinegar in medium saucepan.
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8
Bring to simmer, stirring to dissolve sugar.
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9
Add orange strips; simmer until translucent, about 10 minutes.
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10
Drain.
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11
Cool on sheet of foil.
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12
(Can be made 1 week ahead.
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13
Cover and refrigerate.)
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14
Preheat oven to 375F.
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15
Butter 15x10x1-inch jelly-roll pan.
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16
Line bottom of pan with parchment paper; butter parchment.
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17
Whisk first 6 ingredients in medium bowl to blend.
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18
Heat milk in medium saucepan over medium heat to 150F.
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19
Using electric mixer, beat sugar and eggs in large bowl until fluffy, about 4 minutes.
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20
Beat in vanilla and grated orange peel.
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21
Beat in flour mixture until just blended.
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22
Gradually beat in warm milk.
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23
Pour batter into pan.
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24
Bake cake until tester inserted into center comes out clean, about 10 minutes.
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25
Spread kitchen towel on work surface; cover with parchment.
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26
Sprinkle parchment lightly with powdered sugar.
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27
Run knife around edge of pan to loosen cake.
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28
Invert hot cake onto parchment.
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29
Peel parchment off top of cake.
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30
Starting at 1 long side and using towel as aid, gently roll up cake jelly-roll style.
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31
Cool.
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32
Using electric mixer, beat first 5 ingredients in large bowl until smooth.
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33
Gradually add powdered sugar, beating until smooth.
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34
Cover and chill until firm but spreadable, about 45 minutes.
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35
Unroll cake; remove second sheet of parchment.
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36
Spread scant 2 cups frosting over cake; starting at 1 long side, roll up jelly-roll style.
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37
Place cake, seam side down, on platter.
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38
Starting 1 inch in from end of cake, turn knife on sharp diagonal and cut to remove one 3-inch-long triangular piece of cake.
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39
Spread 1 tablespoon frosting on cut side of cake piece.
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40
Attach frosted side of cake piece to side of cake near end.
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41
Spread remaining frosting over top and sides of cake and cake piece.
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42
Using tines of fork, draw circles on cake ends to resemble tree rings.
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43
Draw fork along length of cake to form bark design.
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44
Cover and chill overnight.
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45
(Can be made 1 day ahead.
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46
Keep chilled.
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47
Let stand 2 hours at room temperature before continuing.)
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48
Sprinkle log with glazed orange peel strips.